Server settings

24-character Double-Take Availability activation code

Values: Unique value for each customer

Default: N/A

GUI Setting: Server Properties, Licensing tab, Activation Code

Specifies the adapter to use when establishing a connection. This option should not be changed.

Values: 2 Encryption, 4 Network Data Representation

Default: 4

GUI Setting: None

24-character activation code for specific add-on components

Values: Unique value for each customer

Default: N/A

GUI Setting: Server Properties, Licensing tab, Additional Codes

Indicates if the server uses Active Directory to advertise itself so that the Management Console can populate the server tree

Values: 0 Do not use Active Directory advertisement, 8 Use Active Directory advertisement

Default: 8

GUI Setting: Server Properties, Setup tab, Advertise service with Active Directory

If Active Directory advertisement is enabled, there is a 200 byte impact on the Active Directory service for each server that registers. The Double-Take service registers with Active Directory at startup and unregisters at shutdown.

Specifies which IP addresses to failover

Values: 0 Failover only monitored IP addresses, 1 Failover all IP addresses

Default: 1

GUI Setting: Failover Control Center, Monitor Settings, Items to Failover, IP Address(es)

Specifies whether or not all IP addresses must fail for failover to take place

Values: 0 any IP address can fail, 1 All IP addresses must fail

Default: 1

GUI Setting: Failover Control Center, Monitor Settings, Failover Trigger, All Monitored IP Addresses Fail

Specifies directories that, if included in the replication set, will be excluded from the archiving process

Values: Any valid path

Default: DTArchiveBin RECYCLER

GUI Setting: None

Specifies files that, if included in the replication set, will be excluded from the archiving process. Wildcard characters are not allowed.

Values: any valid file name

Default: autoexec.bat config.sys

GUI Setting: None

The number of times a file archive is attempted

Values: any integer

Default: 10

GUI Setting: None

The length of time, in milliseconds, to delay between attempts to archive a file

Values: any integer

Default: 1000

GUI Setting: None

Specifies the base file name used for the archive preview report. The replication set will be prepended to the file name.

Values: any valid file name

Default: archivepreview.txt

GUI Setting: Server Properties. Logging tab, Archive Preview, Filename

Specifies the maximum size, in bytes, of the archive preview report. Once the file reaches this size, no additional data is written to the file.

Values: any valid integer

Default: 10485760

GUI Setting: Server Properties. Logging tab, Archive Preview, Maximum Length

Specifies if a file must have a modified date that is older than the last mirror complete time in order to be archived

Values: 0 Do not require a file to be older than the last mirror complete time, 1 Require a file to be older than the last mirror complete time

Default: 0

GUI Setting: None

Specifies how files are archived

Values: 0 Archiving is triggered by file access date, 1 Archiving is triggered by file modified date, 2 Archiving is triggered by file creation date

Default: 0

GUI Setting: None

Specifies if the archive file name uses a name or IP address

Values: 0 Archived files are stored with the server source IP address, 1 Archived files are stored with the source server name

Default: 0

GUI Setting: None

Specifies whether to reinstate the target connection(s) when the source machine is brought online after a source machine failure

Values: 0 Do not reconnect, 1 Reconnect

Default: 1

GUI Setting: Server Properties, Setup tab, Source Module Startup Options, Automatically Reconnect During Source Initialization

Specifies whether to remirror when a source is brought online after an auto-disconnect

Values: 0 Do not remirror, 1 Perform a file differences checksum mirror, 2 Perform a full mirror, 3 Perform a file differences mirror, 4 Perform a date comparison mirror and send data only if the source data is newer than the target data.

Default: 1

GUI Setting: Server Properties, Setup tab, Source Module Startup Options, Perform Remirror After Auto-Reconnect

Specifies how often, in seconds, the source should check for connections that have been reconnected but still need to be remirrored

Values: any integer

Default: 30

GUI Setting: None

Determines whether or not a source that has lost its connection with a target will attempt to reconnect to the target

Values: 0 Do not attempt to reconnect, 1 Attempt to reconnect

Default: 1

GUI Setting: None

Location on the target of the backup of the replication sets

Values: any valid path

Default: the location where the Double-Take Availability files were installed

GUI Setting: None

Calculates the approximate size of a replication set by using the size of the volume and subtracting the free space

Values: 0 Disabled, 1 Enabled

Default: 0

GUI Setting: None

If your replication set contains a large number of files, for example, ten thousand or more, you may want to disable the calculation of the replication set size so that data will start being mirrored sooner. If calculation is enabled, the source calculates the file size before it starts mirroring. This can take a significant amount of time depending on the number of files and system performance.

Disabling calculation will result in the mirror status not showing the percentage complete or the number of bytes remaining to be mirrored. CalculateByVolume can be enabled as a workaround. This setting will get the amount of disk space in use for the entire volume from the operating system, so the calculation occurs instantaneously. However, if the entire volume is not being replicated, the mirror percentage complete and bytes remaining will be incorrect accordingly.

Specifies whether or not the replication set size should be calculated on connection

Values: 0 Do not calculate on connection, 1 Calculate on connection

Default: 1

GUI Setting: Connection Manager, Mirroring tab, Calculate Replication Set size on connection

Setting to allow for the difference checksum option on mirror, verify, or restore to ignore the date, time, and size of the file and perform a checksum calculation on all files

Values: 0 Checksum using date, time, size comparison, 1 Checksum all files regardless of the date, time, or file size

Default: 1

GUI Setting: Server Properties, Source tab, Mirroring or Verify, Block Checksum All Files on a Difference Mirror

Location of a Microsoft Cluster Service installation, if it exists

Values: any valid path

Default: determined by the Microsoft Cluster Service installation

GUI Setting: None

Name of the database file containing connection information

Values: any valid file name

Default: connect.sts

GUI Setting: Server Properties, Database tab, Database Files, Connection

Enables additional logging for out of order acknowledgement errors

Values: 0 Do not create a logging file, 1 Create a logging file

Default: 0

GUI Setting: None

The location of the Double-Take Availability file attribute, replication set, connection, and schedule database files

Values: any valid path

Default: the location where the Double-Take Availability files were installed

GUI Setting: Server Properties, Database tab, Database Files, Folder

The default primary IP address in a multi-homed server

Values: any valid IP address that will act as your primary IP address for connecting the source to the target

Default: <null>

GUI Setting: Server Properties, Network tab, Interface, Default Address

The default protocol

Values: 1 IP protocol

Default: 1

GUI Setting: Server Properties, Network tab, Interface, Default Protocol

TCP/IP is the only protocol currently supported.

Internal setting used by Double-Take Backup for recoveries. Do not modify this setting.

Number of seconds to delay the arbitration process. This option allows time for the network to become stable before trying to execute arbitration logic, for example, when a cluster failover has occurred, but the network has a lag before it returns to a stable state. Arbitration should not start until the network is back in that stable state.

Values: any positive number

Default: 0

GUI Setting: None

Delays the GeoCluster Replicated Disk resource connection to allow the cluster service enough time to reset

Values: 1-15

Default: 3

Port used by pre-5.2 versions for directed UDP communications

Values: 1025 - 65535

Default: 1105

GUI Setting: None

Specifies whether or not attributes (read-only, hidden, and so on) are replicated to the target

Values: 0 Enable attribute replication, 1 Disable attribute replication

Default: 0

GUI Setting: None

Specifies whether or not operations are dropped or retried after an access denied error

Values: 0 The operation will be retried, 1 The operation will be dropped

Default: 1

GUI Setting: None

Determines if an additional attempt is made to access a file by a Microsoft API call if the Double-Take Availability call fails.

Values: 0 When opening a file using the Double-Take Availability driver fails, attempt to open the file usingthe Microsoft Win32 API, 1 When opening a file using the Double-Take Availability driver fails, skip the file and document it in the Double-Take Availability log

Default: 1

GUI Setting: None

If the value is set to 0 and the Win32 call also fails, Double-Take Availability will skip the file and document it in the Double-Take Availability log

Specifies how often, in minutes, a snapshot of the disk quota is taken as a backup in case the live registry is not usable at failover

Values: any integer

Default: 240

GUI Setting: None This option is for full-server products.

Specifies how often, in minutes, a snapshot of the registry is taken as a backup in case the live registry is not usable at failover

Values: any integer

Default: 240

GUI Setting: None This option is for full-server products.

Specifies if e-mail notification is enabled

Values: 0 E-mail notification is disabled, 1 E-mail notification is enabled

Default: 0

GUI Setting: Server Properties, E-mail Notification tab, Enable notification

This is a read-only setting. If you change this setting using the DTCL SET command or via the registry editor, e-mail notification will not automatically start. You must use the GUI or the DTCL EMAIL ENABLE command to start e-mail notification.

Identifies the Windows Event Viewer messages that are excluded from e-mail notification.

Values: Comma or semicolon separated list of Event Viewer IDs. You can indicate ranges within the list.

Default: None

GUI Setting: Server Properties, E-mail Notification tab, Exclude these Event IDs

You must disable and re-enable e-mail notification for a change to take effect.

Specifies the e-mail address that will appear in the From field of Double-Take Availability generated e-mail messages.

Values: Any valid e-mail address, up to 256 characters

Default: None

GUI Setting: Server Properties, E-mail Notification tab, From Address

Specifies which Event Viewer messages are sent via e-mail

Values: 1 Error messages will be sent via e-mail, 2 Warning messages will be sent via e-mail, 3 Information messages will be sent via e-mail

Default: 1,2

GUI Setting: Server Properties, E-mail Notification tab, Include

You must disable and re-enable e-mail notification for a change to take effect.

Specifies the e-mail address(es) that will receive Double-Take Availability generated e-mail messages.

Values: A comma separated list of valid e-mail addresses, up to 256 addresses. Each address is limited to 256 characters.

Default: None

GUI Setting: Server Properties, E-mail Notification tab, Send To

The password required for SMTP server authentication

Values: Any valid password text

Default: None

GUI Setting: Server Properties, E-mail Notification tab, Log on to SMTP Server, Password

Since the password is encrypted for security, this entry cannot be displayed or changed through the registry or through DTCL.

The name of the SMTP server for e-mail notification

Values: Any valid server name text

Default: None

GUI Setting: Server Properties, E-mail Notification tab, Mail Server (SMTP)

Specifies the port that the SMTP e-mail server is using

Values: any valid port number

Default: 25

GUI Setting: None

Specifies if SMTP server authentication for e-mail notification is enabled or disabled

Values: 0 SMTP authentation is disabled, 1 SMTP authenticaion is enabled

Default: 0

GUI Setting: Server Properties, E-mail Notification tab, Log on to SMTP Server

Your SMTP server must support the LOGIN authentication method to use this feature. If your server supports a different authentication method or does not support authentication, you may need to add the Double-Take Availability server as an authorized host for relaying e-mail messages. This option is not necessary if you are sending exclusively to e-mail addresses that the SMTP server is responsible for.

Specifies if the Event Viewer message will be appended to the end of the subject line for e-mail notification

Values: 0 Event Viewer message is not included in the subject line, 1 Event Viewer message is included in the subject line

Default: 1

GUI Setting: Server Properties, E-mail Notification tab, Add event description to subject

Specifies unique text which will be inserted at the front of the subject line for each Double-Take Availability generated e-mail message. This will help distinguish the Double-Take Availability messages from other messages.

Values: Any valid text

Default: Double-Take Availability Notification

GUI Setting: Server Properties, E-mail Notification tab, Subject Prefix

The user ID required for SMTP server authentication

Values: Any valid user ID text

Default: None

GUI Setting: Server Properties, E-mail Notification tab, Log on to SMTP Server, Username

Since the username is encrypted for security, this entry cannot be displayed or changed through the registry or through DTCL.

Indicates if Double-Take Availability DHCP support is enabled

Values: 0 Disabled, 1 Enabled

Default: 1

GUI Setting: None

Specifies if the top-level folders of a replication set are encrypted on the source, they will be encrypted on the target as well

Values: 0 Disabled, 1 Enabled

Default: 1

GUI Setting: None

If the top-level folders in a replication set are not encrypted, disabling this option may obtain a small performance improvement.

Indicates if Double-Take Availability will correct any short file names created by the operating system on the target during a mirror or for create and rename operations during replication

Values: 0 Do not correct any short file names on the target, 1 Correct short file names on the target

Default: 0

GUI Setting: None

Specifies whether Double-Take Availability snapshot functionality is enabled

Values: 0 Double-Take Availability snapshot functionality is disabled, 1 Double-Take Availability snapshot functionality is enabled

Default: 1

GUI Setting: None

This setting only affects Double-Take Availability snapshot functionality. If this setting is disabled, other snapshot software such as Microsoft Volume Shadow Copy will be unaffected.

Queues tasks inline with replication data

Values: 0 Disable task command processing, 1 Enable task command processing

Default: 0

GUI Setting: Server Properties, Setup tab, Setup Options, Enable Task Command Processing

Returns the host SPN (Service Principle Name) to its original setting on failback

Values: 0 Disabled, 1 Enabled

Default: 0

GUI Setting: Failover Control Center, Monitor Settings, Active Directory, Failback Hostname

If you are using Active Directory, this option should be enabled or you may experience problems with failback.

Automatically removes the host SPN (Service Principle Name) from Active Directory on the source

Values: 0 Disabled, 1 Enabled

Default: 0

GUI Setting: Failover Control Center, Monitor Settings, Active Directory, Failover Hostname

If you are using Active Directory, this option should be enabled or you may experience problems with failover.

Determines if failover will occur when receiving a router message back from an IP address on the network

Values: 0 Failover will not occur when receiving a destination host unreachable message, 1 Failover will occur when receiving a destination host unreachable message

Default: 1

GUI Setting: None

The path and file name to the Failover Control Center online help file

Default: C:\Program Files\DoubleTake\online help\fcc\ wwhelp.htm

GUI Setting: None Do not change this value or the online help will not work.

The number of times a failed driver call will be retried by the service.

Values: 1 - 65535

Default: 10

GUI Setting: None

When a mirror is started, one thread reads from the disk and builds the file queue. Another set of threads reads files off of the queue and sends them to the target. This setting is the maximum size of the queue in entries. If you had 100 files to be mirrored and this was set to 16 (the default value), the first thread would fill the queue to a maximum of 16 entries.

Values: 1 - 65535

Default: 16

GUI Setting: None

This value must be set prior to starting the mirror process. The higher the number, the more memory that is used.

Specifies additional failover options

Values: 0 Use standard failover add / replace settings with no additional settings, 1 Replace the target server name with that of the source and add the source IP address, 2 Add the source server name to the target and replace the target IP address, 3 Replace the target server name with that of the source and replace the target IP address

Default: 0

GUI Setting: Failover Control Center, Monitor Settings, Failover Method

Specifies if verification will be performed with every difference mirror

Values: 0 Verification is not performed with every difference mirror, 1 Verification is performed with every difference mirror

Default: 0

GUI Setting: None

Specifies the length of time, in seconds, to generate a hard link report

Values: any valid integer

Default: 3600

GUI Setting: None

Specifies the location where hard links will be logged. If no path is specified, the location defined in LogDir will be used.

Values: any valid path

Default: None

GUI Setting: None

Specifies whether heartbeat debugging information is generated

Values: 0 not generated, 1 Generated

Default: 0

GUI Setting: None

Number of seconds without receiving a heartbeat before a remote machine is considered unavailable

Values: 0 - 65535

Default: 10

GUI Setting: None

Indicates the IP address(es) to be ignored by the Management Console. An ignored IP address will not be displayed in the Management Console servers tree.

Values: a semi-colon separate list of IP addresses in the format x.x.x.x

Default: none

GUI Setting: None

Ratio of replication packets to one mirror packet

Values: 0 - 65535

Default: 5

GUI Setting: Server Properties, Source tab, Queue Ratio, Replication Packets to 1 Mirror Packet

An HPQueueRatio of 5 indicates 5 replication packets to 1 mirror packet. If you change this value, the source service must be stopped and restarted to implement the change.

Specifies alternate streams to skip during mirroring and replication

Values: a semi-colon separate list of stream names. The stream names are not case-sensitive

Default: none

GUI Setting: None

Specifies if the archive bit is compared during verification

Values:0 Archive bit is compared during a verification, 1 Archive bit is not compared during a verification

Default: 1

GUI Setting: None

Specifies if file and directory delete operations will be replicated to the target

Values: 0 Delete operations are replicated to the target, 1 Delete operations are not replicated to the target

Default: 0

GUI Setting: Server Properties, Source tab, Replication, Ignore Delete Operations

Identifies if Double-Take Availability will use PPP (Point-to-Point Protocol) or SLIP (Serial Line Internet Protocol) adapters

Values: 0 Double-Take Availability will send out heartbeats across the PPP/SLIP adapter, 1 Double-Take Availability will not send out heartbeats across the PPP/SLIP adapter

Default: 1

GUI Setting: None

Specifies if thumbnails will be replicated to the target.

Values:0 Double-Take Availability will mirror and replicate all data streams, 1 Double-Take Availability will not mirror or replicate any data about the alternate data streams for thumbnail images. When comparing data for a verification or difference mirror,alternate data streams for thumbnails will not be reported as different.

Default: 1

GUI Setting: None

If you change this value to 0, you must restart the Double-Take service in order for the Double-Take Availability driver to begin sending all data stream information to the service. If you change this value to 1, you do not need to restart the service.

Specifies whether failures to write a file on the target are logged

Values: 0 Log all write failures on the target, 1 or any larger integer indicates that number of write failures which will be ignored before starting to log the write failures

Default: 0

GUI Setting: None

Specifies whether the system volume information folder is mirrored and replicated

Values:0 Do not include the system volume information folder, 1 Include the system volume information folder

Default:0

GUI Setting: None

Path specified during the Double-Take Availability installation

Values: any valid path

Default: specified during installation

GUI Setting: None

Amount of memory, in KB, that may be allocated to the intermediate queue by the system memory manager when MemoryAllocatorMode is set to mixed mode (2).

Values: 512-4194304

Default: 65536

GUI Setting: None

The Double-Take service must be restarted in order for this change to take effect.

Specifies whether or not to failover the IP addresses during failover

Values:0 Do not failover IP addresses 1 Failover IP addresses

Default: 1

GUI Setting: Failover Control Center, Monitor Settings, Items to Failover, IP Address(es)

Specifies the number of times an operation is retried if the driver return an error

Values: any valid integer

Default: 10

GUI Setting: None

Specifies the language of the verification log

Values: Depends on LanguagesSupported

Default: Language used during the installation

GUI Setting: Server Properties, Logging, Verification, Language

Specifies the length of time, in seconds, to wait before reading the last modified file time attribute

Values: any valid integer

Default: 15

GUI Setting: None

This option is only used if SendLastModifiedTimeOnClose is disabled

Specifies the functionality of the Double-Take service

Values:0 Neither the source nor target modules are loaded, 1 Only the source module is loaded, 2 Only the target module is loaded, 3 Both the source and target modules are loaded

Default: 3

GUI Setting: None

This setting will not take effect until the Double-Take service has been restarted.

Specifies whether orphan files are logged to the Double-Take Availability log on the target

Values: 0 Do not log the orphan files to the Double-Take Availability log on the target, 1 Log the orphan files to the Double-Take Availability log on the target

Default: 0

GUI Setting: Connection Manager/Restoration Manager, Orphans tab, Log Orphaned Files to Target List

The location of the Double-Take Availability messages/alerts, verification, and statistics log files

Values: any valid path

Default: the location where the Double-Take Availability files were installed

GUI Setting: Server Properties, Logging tab, Folder

The name of the Double-Take Availability messages/alerts log file

Values: any valid file name

Default: DTLog

GUI Setting: None

Indicates whether hard links are logged to replication_set_name.log when the replication set size is calculated

Values: 0 Hard links are not logged, 1 Hard links are logged

Default: 0

GUI Setting: None

Specifies the types of messages logged to the.dtl files

Values: 0 No messages will be logged, 1 Only alert messages will be logged, 2 Alert and release messages will be logged, 3 Alert, release, and debug messages will be logged

Default: 2

GUI Setting: None

Specifies the number of checksum values retrieved from the target

Values: any integer

Default: 32

GUI Setting: None

Number of network requests that can be processed simultaneously. Windows is limited to 5 simultaneous requests.

Values: 0 - 65535

Default: 5

GUI Setting: None

Double-Take Software recommends that you not change this value.

Maximum size, in bytes, of any .dtl log file

Values:limited by available disk space

Default: 1048576

GUI Setting: Server Properties, Logging tab, Messages & Alerts, Maximum Length

The maximum length of a file name (the entire volume\directory\filename including slashes, spaces, periods, extensions, and so on) that will be displayed in the Double-Take Availability log file and the Windows Event Viewer. File names longer than the MaxDisplayablePath will be truncated and will be followed by an ellipsis (...).

Values:1-32760

Default: 32760

GUI Setting: None

Maximum number of .dtl log files that can exist at one time. When Double-Take Availability creates a new .dtl file, if this number is exceeded, the oldest .dtl file is deleted.

Values: 1 - 999

Default: 5

GUI Setting: Server Properties, Logging tab, Messages & Alerts, Maximum Files

Determines whether or not Double-Take Availability will send over multiple remove orphan operations. Double-Take Availability will send over the operations if a directory has more files than this number.

Values: 0 - 131072

Default: 1000

GUI Setting: None

A generic, application wide setting specifying the number of retry attempts for processes such as creating sockets, starting the service, and so on

Values: any integer

Default: 5

GUI Setting: None

Maximum merged op size (in bytes) used during replication

Values: 1 - 131072

Default: 65536

GUI Setting: None

The path and file name to the Management Console online help file

Default: C:\Program Files\DoubleTake\online help\mc\ wwhelp.htm

GUI Setting: None

Do not change this value or the online help will not work.

Determines what action is taken when the MemoryQueueToDiskThreshold is met

Values: 0 Auto-disconnect processing is initiated when theMemoryQueueToDiskThreshold has been met. Connections will be reestablished when auto-reconnect occurs, 1 The Double-Take service stops pulling operations from the driver when theMemoryQueueToDiskThreshold has been met. The target will pause the source.The service will resume pulling operations when the target tells the source to resume, 2 The source and target begin queuing operations to disk.

Default: 2

GUI Setting: None

A percentage of QmemoryBufferMax that will trigger queuing to disk.

Values: any valid percentage

Default: 100

GUI Setting: None

The minimum file size, in bytes, that will be compressed. Files smaller than this size will not be compressed.

Values: any file size

Default: 1024

GUI Setting: None

Block size, in bytes, used in the mirroring process

Values: 1 - 1048576

Default: 65536

GUI Setting: Server Properties, Source tab, Mirror Queue, Size of Mirror Packets

A higher block size value gives you better throughput, but only to a certain point, then it starts using more memory (this has to do with the way memory is allocated and deallocated). A lower block size value produces slower throughput, but uses memory efficiently.

Specifies if Windows 200x encrypted files are mirrored

Values: 0 Encrypted files are not mirrored, 1 Encrypted files are mirrored

Default: 1

GUI Setting: None

Determines if the mirror process overwrites existing files

Values: 0 never overwrite, 1 always overwrite, 2 overwrite if older

Default: 1

GUI Setting: None

Maximum number of mirror operations that can be queued on the source machine

Values: 1 - 65535

Default: 1000

GUI Setting: Server Properties, Soruce tab, Mirror Queue, Maximum Pending Mirror Operations

Specifies whether or not empty files, zero byte files, are included in a mirror

Values: 0 Zero byte files are skipped and not mirrored to the target, 1 All files are mirrored to the target

Default: 1

GUI Setting: None

If MirrorZeroKFiles is enabled (0), zero byte files are skipped during a full mirror, file differences mirror, and a verification with synchronization. Zero byte files that contain alternate data streams that are not empty, will still be skipped if MirrorZeroKFiles is enabled.

Specifies the number of heartbeats that can go unanswered by the source before failover occurs, when using Double-Take service responses to monitor for failover

Values: 1 - 65535

Default: 20

GUI Setting: Failover Control Center, Monitor Settings, Missed Packets

Specifies the number of requests sent by the target that go unanswered by the source before failover occurs, when using network responses to monitor for failover

Values: 1 - 65535

Default: 5

GUI Setting: Failover Control Center, Monitor Settings, Missed Packets

Specifies if orphaned files are deleted or moved to the directory specified by MoveOrphansDir

Values: 1 Move, 0 Delete

Default: 0

GUI Setting: Connection/Restoration Manager, Orphans tab, Move/Delete Orphan Files

Indicates the name of the directory where orphaned files will be moved if MoveOrphanedFiles=1

Values: any valid path

Default: the location where the Double-Take Availability files were installed

GUI Setting: Connection/Restoration Manager, Orphans tab, Move Orphaned Files to following location

Specifies whether or not to failover machine names

Values: 0 Do not failover machine names, 1 Failover machine names

Default: 1

GUI Setting: Failover Control Center, Monitor Settings, Items to Failover, Server Name

Port used by pre-5.2 versions for TCP communications

Values: 1025 - 65535

Default: 1100

GUI Setting: None

Specifies the interval, in seconds, at which Double-Take Availability will attempt to reconnect to the target

Values: any positive number

Default: 10

GUI Setting: None

The maximum length of time, in seconds, to wait on a network connection. If data is not received over a network connection within the specified time limit, the connection is closed. During idle periods, Double-Take Availability sends small amounts of keep-alive data at an interval 1/6 of the NetworkTimeout value to keep the socket from being inadvertently closed.

Values: any integer

Default: 120

GUI Setting: None

If you are archiving files and it takes longer than the NetworkTimeout specified (for example, this may happen if the DTArchiveBin is located on an alternate volume), the archive operation will complete on the target, but the full file will not be changed to a link on the source because the source detected the network timeout.

24-character activation code for a node-locked license

Values: Unique value for each customer

Default: N/A

GUI Setting: Server Properties, Licensing tab, Additional Codes

24-character code that is used to generated a node-locked license

Values: Unique value for each customer

Default: N/A

GUI Setting: Server Properties, Licensing tab, Node-Locking, Server Information

Specifies the number of operations that can be stored in the memory queue prior to queuing to disk.

Values: 0 There is no limit to the number of operations that can be stored in the memory queue, 1 or any larger integer The number of operations that can be stored in the memory queue

Default: 200000

GUI Setting: None

Specifies whether operations from the Double-Take Availability driver are logged

Values: 0 Do not log operations, 1 Log operations

Default: 0

GUI Setting: None

Specifies, in seconds, how often a ping is sent to the source from a monitoring target

Values: 1 - 65535

Default: 5

GUI Setting: Failover Control Center, Monitor Settings, Monitor Interval

Port connection for core Double-Take Availability communications

Values: 1025 - 65535

Default: 6320

GUI Setting: Server Properties, Network tab, Communications Port and Management Console, File, Options, Configuration tab, Communications Port

Location on the target where the target post-failback script is located

Values: Any valid path

Default: <null>

GUI Setting: Failover Control Center, Monitor Settings, Scripts, Target, Post-Failback

Arguments to be used with the target post-failback script

Values: Any valid argument

Default: <null>

GUI Setting: Failover Control Center, Monitor Settings, Scripts, Target, Post-Failback, Arguments

Location on the target where the target post-failover script is located

Values: Any valid path

Default: <null>

GUI Setting: Failover Control Center, Monitor Settings, Scripts, Target, Post-Failover

Arguments to be used with the target post-failover script

Values: Any valid argument

Default: <null>

GUI Setting: Failover Control Center, Monitor Settings, Scripts, Target, Post-Failover, Arguments

Location on the target where the target pre-failback script is located

Values: Any valid path

Default: <null>

GUI Setting: Failover Control Center, Monitor Settings, Scripts, Target, Pre-Failback

Arguments to be used with the target pre-failback script

Values: Any valid argument

Default: <null>

GUI Setting: Failover Control Center, Monitor Settings, Scripts, Target, Pre-Failback, Arguments

Specifies whether or not to wait for the target pre-failback script to complete before finishing a failback

Values: 0 Do not wait, 1 Wait

Default: 0

GUI Setting: Failover Control Center, Monitor Settings, Scripts, Target, Pre-Failback, Delay failback until script completes

Location on the target where the target pre-failover script is located

Values: Any valid path

Default: <null>

GUI Setting: Failover Control Center, Monitor Settings, Scripts, Target, Pre-Failover

Arguments to be used with the target pre-failover script

Values: Any valid argument

Default: <null>

GUI Setting: Failover Control Center, Monitor Settings, Scripts, Target, Pre-Failover, Arguments

Specifies whether or not to wait for the target pre-failover script to complete before finishing a failover

Values: 0 Do not wait, 1 Wait

Default: 0

GUI Setting: Failover Control Center, Monitor Settings, Scripts, Target, Pre-Failover, Delay failover until script completes

The priority level at which the Double-Take service runs.

Values: 3

Default: 3

GUI Setting: None

The Double-Take service runs at normal priority by default, which is adequate in most cases. However, there are some high-load situations where Double-Take Availability needs a higher priority in order to move data through its queues and transmit the data to the target. One specific example is with bulk inserts to a SQL Server database. During this operation, SQL Server uses so much CPU that Double-Take Availability does not get enough CPU cycles to transmit data as quickly as it otherwise might. Boosting the priority of the Double-Take service process to high on the source enables Double-Take Availability to transmit data as quickly as possible and results in less data being queued on the source. This boost usually results in better overall performance because Double-Take Availability will not queue as much data to disk, which degrades overall performance. If Double-Take Availability replication traffic is not being sent to the target as quickly as possible during high load processes, boost the priority of Double-Take Availability on the source. This condition can be recognized by monitoring queued replication, and network and CPU utilization. If CPU utilization is high, a lot of data is being queued, and the utilization of the network between the source and target is low, that means Double-Take Availability is not getting enough CPU to transmit data as quickly as possible.

The location where the queue is stored.

Values: any valid path

Default: the location specified during the installation

GUI Setting: Server Properties, Queue tab, Location, Folder

For best results and reliability, you should select a dedicated, non-boot volume. The queue should be stored on a fixed, local NTFS volume. This location also stores the Double-Take Availability driver pagefile.

The size, in MB, of each queuing transaction log file.

Values: any valid file size, up to 4095 MB

Default: 5

GUI Setting: None

The minimum amount of disk space, in MB, in the specified QJournalDir that must be available at all times.

Values: dependent on the amount of physical disk space available

Default: 50

GUI Setting: Server Properties, Queue tab, Memory and Disk Usage, Minimum Free Space

The QJournalFreeSpaceMin should be less than the amount of physical disk space minus QJournalSpaceMax.

The maximum amount of disk space, in MB, in the specified QJournalDir that can be used for Double-Take Availability queuing. When this limit is reached, Double-Take Availability will automatically begin the auto-disconnect process.

Values: dependent on the amount of physical disk space available

Default: Unlimited

GUI Setting: Server Properties, Queue tab, Memory and Disk Usage, Maximum disk space for queue

The unlimited setting allows the disk queue usage to automatically expand whenever the available disk space expands. Setting this option to zero (0) disables disk queuing. Even if you are using the Unlimited option, Double-Take Availability will only store 16,384 log files. If you are using the default 5MB file size, this is approximately 80GB of data. If you anticipate needing to be able to queue more data than this, you should increase the size of the log files.

Specifies if the disk queues are write-through mode

Values: 0 Disk queues are not write-through mode, 1 Disk queues are write-through mode

Default: 0

GUI Setting: None

While write-through mode may decrease the frequency of auto-disconnects, it may also decrease the performance of the source server.

The amount of Windows system memory, in MB, that, when exceeded, will trigger queuing to disk.

Values: dependent on the amount of physical memory available; minimum of 32 MB

Default: 128 or 512 MB, depending on your operating system

GUI Setting: Server Properties, Queue tab, Memory and Disk Usage, Maximum system memory for queue

Identifies if the Double-Take service will reopen closed files on the quorum drive

Values: 0 The Double-Take service will not attempt to reopen a closed file on the quroum drive to get security descriptors or last modified times, 1 The Double-Take service will attempt to reopen a closed file on the quroum drive to get security descriptors or last modified times.

Default: 1

GUI Setting: None

The percentage of the queue that must be in use to trigger an alert message in the Windows Event Viewer.

Values: any valid percentage

Default: 50

GUI Setting: Server Properties, Queue tab, Queue Usage Alert Threshold, Alert at following queue usage percentage

Specifies if all orphan files will be removed or only those based on RemoveOrphanTime

Values: 0 Remove orphans based on the entry RemoveOrphansTime, 1 Remove all orphans

Default: 1

GUI Setting: Connection/Restoration Manager, Orphans tab, Remove All Orphans

Specifies the amount of time, in minutes, that must be expired before an orphan file is removed

Values: 1 - 131072

Default: 60

GUI Setting: Connection/Restoration Manager, Orphans tab, Remove Orphans not modified within the following time period

Specifies if shares are removed on the target machine when a Double-Take Availability replication set is disconnected from a target or a source machine is manually shutdown by the administrator. (Shares are not removed if either the source or target machines fail.)

Values: 0 Remove shares from the target, 1 Do not remove shares from the target

Default: 1

GUI Setting: None

Specifies whether or not to replace the target identity with the source identity during a failover

Values: 0 Do not replace, 1 Replace

Default: 0

GUI Setting: Failover Control Center, Monitor Settings, Failover Method

Determines whether or not Double-Take Availability replicates permissions and attributes assigned to local (non-domain) users and groups

Values: 0 Do not replicate by name, 1 Replicate by name

Default: 0

GUI Setting: Server Properties, Source tab, Replication, Replicate NT Security by Name

Specifies the script to run if validation of the replication drive fails

Values: Any valid path and script file

Default: <null>

GUI Setting: None

Specifies the interval, in seconds, between validation checks when ReplicationDiskCheckSript is populated

Values: any integer

Default: 300

Name of the database that contains replication set information

Values: any valid file name

Default: DblTake.db

GUI Setting: Server Properties, Database tab, Database Files, Replication Set

Determines if the restoration process overwrites existing files

Values: 0 never overwrite, 1 always overwrite, 2 overwrite if older

Default: 2

GUI Setting: Restoration Manager, Servers tab, Overwrite existing files during restore

Specifies if DTInfo is launched before a failover when protecting a full-server workload

Values: 0 Do not launch DTInfo, 1 Launch DTInfo

Default: 1

GUI Setting: None

If a script is specified, the script is launched on the target before Double-Take Availability executes any snapshots. The snapshot will not be executed until the script has completed. If the script returns an error, the snapshot will still execute.

Values: any valid path and script name

Default: <null>

GUI Setting: None

Specifies if a script specified in RunScriptAtSnaptime is executed

Values: 0 Execute script specified in RunScriptAtSnaptime, 1 Do not execute script specified in RunScriptAtSnaptime

Default: 1

GUI Setting: None

Determines if the statistic.sts (statistics logging) file is saved or ovewritten

Values: 0 overwrite, 1 saved as statistic-old.sts

Default: 1

GUI Setting: None

Name of the database file that contains transmission scheduling information

Values: any valid file name

Default: Schedule.sts

GUI Setting: Server Properties, Database tab, Database Files, Schedule

If you change the name of the database file, the source service must be stopped and restarted to start logging to the new database file.

The number of seconds to wait before checking the transmission schedules to see if transmission should be started or stopped

Values: 1 - 3600

Default: 1

GUI Setting: None

Specifies if the last modified time for directories will be transmitted to the target during a difference mirror

Values: 0 last modified time on directories will not be sent to the target, 1 last modified time on directories will be sent to the target

Default: 1

GUI Setting: None

Specifies whether a file is accessed twice so that the file’s creation time can be modified to match the source

Values: 0 The Double-Take service will not access newly created files that have not been modified. These files on the target will have the date and time of when the file was created on the target, 1 The Double-Take service will access newly created files. These files on the target will have the same date and time as the source.

Default: 0

GUI Setting: None

New files created on the source that have not been modified will have the date and time of when the file is created on the target. The date and time will be corrected to match the source’s true file attributes when a remirror or verification modifies them to match the source or the file is modified by a user or application on the source. For example, if the source machine's clock is set to 2:00 PM and the target machine is set to 4:00 PM, a newly created file that has not been modified will have a time stamp of 4:00 PM when it is applied to the target. If this option is enabled (1), Double-Take Availability will access the file twice, to correctly set the time to 2:00 PM to reflect the file’s true attributes. If this option is disabled (0), Double-Take Availability will not access the file twice, and the file will have the target time of 4:00 PM until it is modified (remirror, verification, or user or application update).

Specifies that the last modified time attribute is sent when a file is closed

Values: 0 Last modified time is sent when Double-Take Availability has not received any additional operations for the file in the time period specified by LastModifiedReadDelay, 1 Last modified time is sent when a file is closed, which may not be immediately depending on system processing

Default: 1

GUI Setting: None

If system processing delays (such as the system cache manager not flushing quickly enough) are causing delays in processing the last modified time, you may want to consider disabling this option (0).

Services that will not be stopped on the target or target image server when using a full-server failover product

Values: Comma separated list of service names

Default: <null>

GUI Setting: None

Used internally by the Double-Take service. Do not modify this entry.

Specifies whether or not to failover shares

Values: 0 Do not failover shares, 1 Failover shares

Default: 1

GUI Setting: Failover Control Center, Monitor Settings, Items to Failover, Share(s)

Specifies how often, in minutes, the share file will be sent to the target

Values: 1 - 65535

Default: 60

GUI Setting: None

Specifies how often, in minutes, the registry is scanned for short file names for use in full-server failover

Values: any valid integer

Default: 240

GUI Setting: None

Specifies the amount of time, in minutes, to wait for the source to shutdown during failover when protecting a full-server workload

Values: any valid integer

Default: 5

GUI Setting: None

The amount of time, in seconds, for the service to wait prior to completing the shutdown so that Double-Take Availability can persist data on the target in an attempt to avoid a remirror when the target comes back online

Values: any valid number of seconds where 0 (zero) indicates waiting indefinitely and any other number indicates the number of seconds

Default: 0

GUI Setting: Server Properties, Setup tab, Server Shutdown Timeout

This setting only controls the service shutdown from the Double-Take Availability clients. It does not control the service shutdown through a reboot or from the Service Control Manager.

A period delimited list of file types that are not compressed, even if compression is enabled.

Values: any period delimited list of file types

Default: mp3.exe.wmv.wma.qt.mpg.mpeg.zip.jpg.jpeg.tiff.tar.rar.cab

GUI Setting: None

Specifies the type of snapshot that Double-Take Availability takes

Values: 0 Create a client-accessible snapshot based on the type of connection established, 1 Always create a client-accessible snapshot, 2 Always create a non-client-accessible snapshot

Default: 0

GUI Setting: None

The number of files to compare during a source newer difference mirror

Values: 1-1000

Default: 16

GUI Setting: None

The number of milliseconds that file time stamps must be different by in order for the files to be considered different. For example, if the value is set to 500, the files must be 501 milliseconds different in order to be considered different.

Values: any valid integer

Default: 500

GUI Setting: None

The number of operations received by the target queue in which the source is waiting for a response

Values: 100 - 20,000

Default: 2000

GUI Setting: None

Path on the source where the source post-failback script is located

Values: Any valid path

Default: <null>

GUI Setting: Failover Control Center, Monitor Settings, Scripts, Source, Post-Failback

Arguments to be used with the source post-failback script

Values: Any valid argument

Default: <null>

GUI Setting: Failover Control Center, Monitor Settings, Scripts, Source, Post-Failback, Arguments

Specifies the folder to use for staging system state files for full-server failover. Do not modify this entry.

Used by full-server workloads to determine how target disk signatures are used. Do not modify this entry.

Indicates which driver statistics are logged to the Double-Take Availability log

Values: 0 No driver statistics are logged, 1 State, 2 Operations, 4 Paging, 8 Timing

Default: 0

GUI Setting: None

Use the sum of various values to log multiple driver statistics. For example, a setting of 5 would log paging and state statistics. A setting of 7 would log paging, operations, and state statistics. A setting of 15 would log all driver statistics.

Default file for logging statistics

Values: any valid file name

Default: statistic.sts

GUI Setting: Server Properties, Logging tab, Statistics, Filename

Specifies if Double-Take Availability logs statistics at startup

Values: 0 Stats logging does not start when Double-Take Availability starts, 1 Stats logging starts when Double-Take Availability starts

Default: 0

GUI Setting: Server Properties, Setup tab, Setup Options, Log Statistics Automatically

Maximum size, in MB, for the statistic.sts file

Values: limited by available disk space

Default: 10485760

GUI Setting: Server Properties, Logging tab, Statistics, Maximum Length

Port used by pre-5.2 versions for DTStat to gather statistics

Values: 1025 - 65535

Default: 1106

GUI Setting: None

Interval, in minutes, in which statistics are written to the statistic.sts file

Values: 0 - 65535

Default: 5

GUI Setting: Server Properties, Logging tab, Statistics, Write Interval

Size of the TCP/IP buffer in bytes.

Values: 4096-7500000

Default: 375000

GUI Setting: None

The default setting creates a TCP window that will accommodate most environments. In most environments, this value will not need to be adjusted. However, if your Double-Take Availability network has a long end-to-end route and the throughput is not where you would expect it to be, then adjusting this parameter may have beneficial results. This value is the bandwidth delay product, which is calculated using the bandwidth of the network (in bits/second) times the round trip time (in seconds) between the two ends. Some recommended settings to improve Double-Take Availability throughput performance are:

Gigabit LAN—The setting should be changed to 375000.

WAN—The setting should be adjusted to 130000.

While the calculations are fairly straight forward, the values that have been suggested are not exact because they depend on round trip time. Some improvements could be gained by adjusting these values either higher or lower. The value suited for your environment can best be determined through trial and error testing.

Temporary directory used when replicating Windows 200x encrypted files.

GUI Setting: C:\Program Files\DoubleTake\Temp

Blocks the target path for all connections, regardless of the source, so that the data cannot be modified

Values: 0 Target paths are not blocked, 1 Target paths are blocked

Default: 0

GUI Setting: None

Do not modify this setting without assistance from Technical Support.

The length of time, in milliseconds, a file is held open on the target

Values: 0 - 2000

Default: 1000

Default: 500

GUI Setting: None

If disk caching on the target is disabled either manually or by default (for example, by default on disks that host Active Directory database files), the target system may be slow during a mirror. If so, descreasing this setting to 100, 10, and 0 will result in incremental improvements, with 0 returning the system performance to normal.

Specifies the length of time, in days, to keep moved files if TGMoveFilesOnDelete is enabled

Values: any valid integer

Default: 0

GUI Setting: Server Properties, Target tab, Move Deleted Files, Remove after the following number of days

Specifies whether or not the attributes compression, ACL, and file mask are written to the target during mirroring and replication

Values: 0 Enable attribute replication 1 Disable attribute replication

Default: 0

GUI Setting: None

The number of times an unfinished operation will be retried on the target before it is discarded. If this value is set to zero (0), an operation will never be discarded and will be retried on the target until it is applied.

Values: 0 - 65536

Default: 0

GUI Setting: None

Indicates that Double-Take Availability allocates an entire file on the first write of a mirror operation

Values: 0 Disabled 1 Enabled

Default: 1

GUI Setting: None

To help eliminate file fragmentation on the target server, Double-Take Availability should allocate the entire file first. With extremely large files, the file allocation may take a long time. Therefore, you may want to disable the file allocation. If you disable file allocation, you will have more fragmentation on the target disk.

Maximum percentage of system memory that can contain mirror data before the target signals the source to pause the sending of mirror operations.

Values: 2-75

Default: 20

GUI Setting: Server Properties, Target tab, Files, Target Mirror Capacity High Percentage

Minimum percentage of system memory that can contain mirror data before the target signals the source to resume the sending of mirror operations.

Values: 1-75

Default: 15

GUI Setting: Server Properties, Target tab, Files, Target Mirror Capacity Low Percentage

The maximum value forTGMirrorCapacityLow is either 75 or TGMirrorCapacityHigh, which ever is lower.

Specifies whether files deleted on the source are actually moved to a different location on the targer rather than being deleted on the target

Values: 0 Files deleted on the source will be deleted on the target, 1 Files deleted on the source will be moved to a different location on the target

Default: 0

GUI Setting: Server Properties, Target tab, Move Deleted Files, Moved deleted files to the following location

If this option is enabled, the deleted files will be moved to the location specified in TGMoveFilesPath.

Specifies where deleted files on the source are being moved to on the target

Values: any valid path

Default: <null>

GUI Setting: Server Properties, Target tab, Move Deleted Files, Moved deleted files to the following location

Minimum number of seconds to wait before retrying a failed operation on a target

Values: 0-65536

Default: 3

GUI Setting: Server Properties, Target tab, Queues, Retry Delay for Incomplete Operations

Specifies whether or not unfinished operations on the target are logged to the Event Viewer

Values: 0 Unfinished operation messages are not logged, 1 Unfinished operation messages are logged

Default: 1

Specifies whether or not Double-Take Availability uses the intermediate cache

Values: 0 Bypass the intermediate cache and write directly to disk, 1 Do not bypass the intermediate cache

Default: 1

GUI Setting: None

Specifies the number of times an operation will be retried on the target before a notification is sent to the source to update the Target Status field of the Management Console.

Values: 0-1024

Default: 10

GUI Setting: None

If you change the setting to 0, the notification will be disabled. Changing this option will only affect how the status is changed on the Target Status field of the Management Console. To solve the underlying issue of why the operations are failing will require investigation into the Double-Take Availability log files.

Interval, in seconds, at which the Failover Control Center updates the monitored machines display

Values: 1 - 9999

Default: 1

GUI Setting: Failover Control Center, Settings, Refresh Rate

Specifies if the Windows NTFS change journal is used to track file changes. If the source is rebooted, only the files identified in the change journal will be remirrored to the target. This setting helps improve mirror times.

Values: 0 Do not track file changes, 1 Track file changes and remirror only changed files on source reboot, 2 Track file changes and remirror only changed files on source reboot and auto-reconnect

Default: 1

GUI Setting: Server Properties, Setup tab, Remirror only Changed Files on Source Reboot

The corresponding GUI setting only allows off (0) and on (1) settings. Therefore, if you set UseChangeJournal to 2, the corresponding GUI setting will be disabled. The GUI setting will be reenabled when UseChangeJournal is set to 0 or 1.

Specifies whether or not messages are logged to the Windows Event Viewer

Values: 0 Do not log messages to the Event Viewer, 1 Log messages to the Event Viewer

Default: 1

GUI Setting: None

Specifies whether or not user intervention is required to initiate a failover

Values: 0 User intervention is not required, 1 User intervention is required

Default: 1

GUI Setting: Failover Control Center, Monitor Settings, Manual Intervention

Specifies whether to create and use a share file or to use the shares that are currently stored in the target memory

Values: 0 Use the shares that are currently stored in the target memory, 1 Create and use a file containing the share information

Default: 1

GUI Setting: Failover Control Center, Monitor Settings, Use .SHR Share Mapping File

Specifies whether the DTVerify.log file will be appended to or overwritten

Values: 0 Overwrite 1 Append

Default: 1

GUI Setting: Server Properties, Logging tab, Verification, Append

Maximum size of the DTVerify.log file in bytes

Values: limited by available hard drive space, up to 4 GB

Default: 1048576

GUI Setting: Server Properties, Logging tab, Verification, Maximum Length

Name of the verification log file

Values: any valid file name

Default: DTVerify.log

GUI Setting: Server Properties, Logging tab, Verification, Filename

The time, in minutes, between when one verification fails and a retry is scheduled to begin.

Values: any valid number

Default: 3

GUI Setting: None

The number of time a verification will be retried.

Values: any valid number

Default: 5

GUI Setting: None

The version of Double-Take Availability that was installed Value: determined by the version installed

Default: determined by the installation

GUI Setting: None

Specifies the script to run if the Double-Take Availability driver were to stop running

Values: Any valid path and script file

Default: <null>

GUI Setting: None