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#     WINDOWS 2008 R1 x64, 2008 R2, 2012 R2 - MPIO HOTFIX INSTALLER
#     Author: Anthony Marino
#     Version: V1.0.1
#     Date: 8/6/2015
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IF ((((Get-WmiObject Win32_OperatingSystem).Version) -like "6.0.*") -and (Test-Path 'C:\Program Files (x86)' -ErrorAction SilentlyContinue))
	{
	# Server 2008 R1 x64
	Write-Host "Server 2008 R1 x64 detected."
	
	# Find out if the MPIO hotfix KB2754704 is installed
	IF (get-HotFix | where {$_.hotfixid -eq "KB2754704"}) 
		{
		# HotFix is installed.
		Write-Host "KB2754704 is already installed."
		} 
	ELSE 
		{
		Write-Host "Installing KB2754704."
		# Download and install the HotFix
		$Source = "http://toolkit.datapipe.net/BesTasks/anthony/ServerSetupUtility/Installers/MPIOHotfixes/Windows6.0-KB2754704-x64.msu"
		$Destination = "C:\Windows\Temp\Windows6.0-KB2754704-x64.msu"
		$client = new-object System.Net.WebClient
		$client.DownloadFile($Source, $Destination)
				
		Start-Process -FilePath wusa.exe -ArgumentList "C:\Windows\Temp\Windows6.0-KB2754704-x64.msu /quiet /norestart" -Wait
		# Cleanup
		Remove-Item C:\Windows\Temp\Windows6.0-KB2754704-x64.msu -Force
		}
	}	

IF (((Get-WmiObject Win32_OperatingSystem).Version) -like "6.1.*")
	{
	# Server 2008 R2
	Write-Host "Server 2008 R2 detected."
	
	# Add registry keys to adjust MPIO
	IF (Get-Service "ClusSvc" -ErrorAction SilentlyContinue)
		{
		# Cluster service detected
		# Add KB2718576 registry changes (clusters only)
		REG ADD "HKLM\System\CurrentControlSet\Services\mpio\Parameters" /v DiskPathCheckEnabled /t REG_DWORD /d 1 /f
		REG ADD "HKLM\System\CurrentControlSet\Services\mpio\Parameters" /v DiskPathCheckInterval /t REG_DWORD /d 0 /f
		}
	
	REG ADD "HKLM\System\CurrentControlSet\Services\mpio\Parameters" /v UseCustomPathRecoveryInterval /t REG_DWORD /d 1 /f				
	REG ADD "HKLM\System\CurrentControlSet\Services\mpio\Parameters" /v PathRecoveryInterval /t REG_DWORD /d 15 /f
	REG ADD "HKLM\System\CurrentControlSet\Services\Disk" /v TimeOutValue /t REG_DWORD /d 30 /f
	REG ADD "HKLM\System\CurrentControlSet\Services\mpio\Parameters" /v PDORemovePeriod /t REG_DWORD /d 25 /f
	REG ADD "HKLM\System\CurrentControlSet\Services\mpio\Parameters" /v RetryCount /t REG_DWORD /d 3 /f
	REG ADD "HKLM\System\CurrentControlSet\Services\mpio\Parameters" /v RetryInterval /t REG_DWORD /d 1 /f
	
	# Find out if the MPIO hotfix KB2754704 is installed
	IF (get-HotFix | where {$_.hotfixid -eq "KB2754704"}) 
		{
		# HotFix is installed.
		Write-Host "KB2754704 is already installed."
		} 
	ELSE 
		{
		Write-Host "Installing KB2754704."
		# Download and install the HotFix
		$Source = "http://toolkit.datapipe.net/BesTasks/anthony/ServerSetupUtility/Installers/MPIOHotfixes/Windows6.1-KB2754704-x64.msu"
		$Destination = "C:\Windows\Temp\Windows6.1-KB2754704-x64.msu"
		$client = new-object System.Net.WebClient
		$client.DownloadFile($Source, $Destination)
		Start-Process -FilePath wusa.exe -ArgumentList "C:\Windows\Temp\Windows6.1-KB2754704-x64.msu /quiet /norestart" -Wait
		# Cleanup
		Remove-Item C:\Windows\Temp\Windows6.1-KB2754704-x64.msu -Force
		}
	
	# Find out if the MPIO hotfix KB2821052 is installed
	IF (get-HotFix | where {$_.hotfixid -eq "KB2821052"}) 
		{
		# HotFix is installed.
		Write-Host "KB2821052 is already installed."
		} 
	ELSE 
		{
		Write-Host "Installing KB2821052."
		# Download and install the HotFix
		$Source = "http://toolkit.datapipe.net/BesTasks/anthony/ServerSetupUtility/Installers/MPIOHotfixes/Windows6.1-KB2821052-x64.msu"
		$Destination = "C:\Windows\Temp\Windows6.1-KB2821052-x64.msu"
		$client = new-object System.Net.WebClient
		$client.DownloadFile($Source, $Destination)
		Start-Process -FilePath wusa.exe -ArgumentList "C:\Windows\Temp\Windows6.1-KB2821052-x64.msu /quiet /norestart" -Wait
		# Cleanup
		Remove-Item C:\Windows\Temp\Windows6.1-KB2821052-x64.msu -Force
		}
	}
	
IF (((Get-WmiObject Win32_OperatingSystem).Version) -like "6.2.*")
	{
	# Server 2012 R1
	Write-Host "Server 2012 R1 detected."
	
	# Find out if the MPIO hotfix KB2821052 is installed
	IF (get-HotFix | where {$_.hotfixid -eq "KB2821052"}) 
		{
		# KB2821052 is already installed.
		Write-Host "KB2821052 is already installed."
		} 
	ELSE 
		{
		Write-Host "Installing KB2821052."
		# Download and install the HotFix
		Invoke-WebRequest http://toolkit.datapipe.net/BesTasks/anthony/ServerSetupUtility/Installers/MPIOHotfixes/Windows8-RT-KB2821052-x64.msu -OutFile C:\Windows\Temp\Windows8-RT-KB2821052-x64.msu
		Start-Process -FilePath wusa.exe -ArgumentList "C:\Windows\Temp\Windows8-RT-KB2821052-x64.msu /quiet /norestart" -Wait
		# Cleanup
		Remove-Item C:\Windows\Temp\Windows8-RT-KB2821052-x64.msu -Force
		}
	}