# Convert Exchange 2007 CCR Storage Group to
# Circular Logging for Exchange migrations
# Author: Andy Grogan
# Version 1.0
# 
# 
#

function modifyStorageGroupCopy($strSG,$Mode){

	Suspend-StorageGroupCopy -Identity $strSG
	
	If($Mode -eq 1){
		Set-StorageGroup -Identity $strSG -CircularLoggingEnabled $True
	}else{
		Set-StorageGroup -Identity $strSG -CircularLoggingEnabled $False
	}
		
	$DB = Get-MailboxDatabase | Where {$_.StorageGroup -eq $strSG.Identity}
	Dismount-Database -Identity $DB
	
	for ($i = 1; $i -le 10; $i++) {   
		write-progress -id 1 -activity "Preparing to Mount Database" -status "Working..." -percentComplete ($i*10);    
		sleep 1;
	}
	
	Mount-Database -Identity $DB
	
	for ($i = 1; $i -le 10; $i++) {   
		write-progress -id 1 -activity "Preparing to Re-Enable Storage Group Copy" -status "Working..." -percentComplete ($i*10);    
		sleep 1;
	}
	
	Resume-StorageGroupCopy -Identity $strSG
}

$CCRServers = Get-MailboxServer | Where {$_.ClusteredStorageType -eq "NonShared"}
$mbsCount = 0

Write-Host "*********************************************************************"
Write-Host "* Exchange 2007 CCR Circular Logging Script"
Write-Host "* Version 1.02"
Write-Host "* Author: Andy Grogan"
Write-Host "*"
Write-Host "* This script can be used to prevent log file build up during large"
Write-Host "* Mailbox Moves between servers"
Write-Host "* "
Write-Host "*"
Write-Host "*********************************************************************"
Write-Host ""
Write-Host "WARNING - This Script enables circular logging on a given storage group." -ForegroundColor Red
Write-Host "This will cause your database backups within the SG to not function." -ForegroundColor Red
Write-Host "Remember to Disable CL when you have completed your moves - disable any" -ForegroundColor Red
Write-Host "Backup jobs which will run when CL is enabled." -ForegroundColor Red
Write-Host ""
Write-Host "The Following CCR Cluster Servers have been found:"
Write-Host ""

Foreach ($cmbs in $CCRServers){
	Write-Host "$mbsCount - $cmbs"
	$mbsCount ++
}

Write-Host ""

$ServerChoice = Read-Host "Please choose a CCR Cluster by its number from the list above"

Write-Host ""

If ($CCRServers.Count -eq $null){
	
	$stgGroup = Get-StorageGroup -Server $CCRServers

}else{

	$stgGroup = Get-StorageGroup -Server $CCRServers[$ServerChoice]
	
}
	$stgCount = 0

Foreach ($stg in $stgGroup){

	Write-Host "$stgCount - $stg"
	$stgCount ++

}

Write-Host ""

$grpChoice = Read-Host "Please choose a storage group by its number from above"

Write-Host ""
Write-Host "Please choose an operational mode:"
Write-Host ""
Write-Host "1. Enable Circular Logging"
Write-Host "2. Disable Circular Logging"
Write-Host ""

$ModeSwitch = Read-Host "Please make a mode choice"

If ($stgGroup.Count -eq $null){

	modifyStorageGroupCopy $stgGroup $ModeSwitch
	
}else{
	
	modifyStorageGroupCopy $stgGroup[$grpChoice] $ModeSwitch
}