= SRM Script: SRM And RDMs =

**Summary**: How to configure RDMs to smoothly work with VMware Site Recovery Manager 5.1. \\
**Date**: 22 March 2013 \\
**Refactor**: 29 April 2025: Checked links and formatting. \\
{{tag>vmware srm powershell}}

While Site Recovery Manager 5.l fully supports the usage of RDMs and this also works just fine there are a few things that will work against you that need to be solved in case you ever have to do a failover recovery. And even while doing a failover test, considering these issues will help you to make your tests faster and more reliable.

The two issues in case:
* [[http://kb.vmware.com/kb/1016106 |ESX(i) hosts with RDM LUNs accessed by MSCS boots slow or has slow LUN rescan]] \\
* [[http://kb.vmware.com/kb/1011340 |Multipathing policies in ESXi 5.x and ESXi/ESX 4.x - Round Robin is not currently supported for Logical Units that are part of a Microsoft Cluster Service (MSCS) virtual machine]] \\

These issues will mean that after recovering VMs with RDMs you'll have to set the path policy to MRU (preferred because it supports [[alua]]) and the IsPerenniallyReserved setting to true for each RDM.

Luckily I wrote a script.

= The Script =
This script can be run directly from the recovery plan as described [[srmpowershell|here]].

Note that this is a rewrite of the original script [[rdmsettings]].

<code powershell>
# Script Details
# Author: Sjoerd Hooft
# Creation Date: 2013-03-22

# Variables
# Setting scriptname
if (!$args[0]){
   Write-Host "First parameter (scriptname) is not provided"
   $scriptname = $myinvocation.mycommand.name}
else{
   $scriptname = $args[0]}
Write-Host "Scriptname = $scriptname"
# Setting scriptlocation
if (!$args[1]){
   Write-Host "Second parameter (scriptlocation) is not provided"
   $scriptlocation = Split-Path $myinvocation.mycommand.path}
else{
   $scriptlocation = $args[1]}
Write-Host "Scriptlocation = $scriptlocation"
# Setting vCenter
if (!$args[2]){
   Write-Host "Third parameter (vCenter) is not provided"
   $vcenter = "vcenter.getshifting.com"}
else{
   $vcenter = $args[2]}
Write-Host "vCenter = $vcenter"
# Setting Recovery Mode
if (!$args[3]){
   Write-Host "Fourth parameter (recoverymode) is not provided"
   $recoverymode = "unknown"}
else{
   $recoverymode = $args[3]}
Write-Host "Recovery Mode = $recoverymode"
# Setting Recovery Plan
if (!$args[4]){
   Write-Host "Fifth parameter (recoveryplan) is not provided"
   $recoveryplan = "unknown"}
else{
   $recoveryplan = $args[4]}
Write-Host "Recovery Plan = $recoveryplan"

$MailServer = "10.10.10.25"
$toemail = "ids@getshifting.com"
$fromemail = "vcenter@getshifting.com"
$timestamp = Get-Date -format "yyyyMMdd-HH.mm"
$csvfile = "$scriptlocation\$scriptname-$timestamp.csv"
$cluster = "HQ SRM"

# Add VMware snapin
if(-not (Get-PSSnapin VMware.VimAutomation.Core -ErrorAction SilentlyContinue)){
   Add-PSSnapin VMware.VimAutomation.Core}

# Email functions
Function Send-Email ($subject, $info){
   Send-MailMessage -To $toemail -From $fromemail -SmtpServer $mailserver -Subject $subject -Body $info -Attachments "$csvfile"}

# Connect to vCenter
Connect-VIServer $vcenter

# Define csv table
$myTable = @()

# Search for RDM files and define required information
foreach ($vm in (Get-Cluster $cluster | Get-VM | Get-HardDisk -DiskType "RawPhysical","RawVirtual")){

   $RDMInfo = "" |select-Object VMName,DiskType,ScsiCanonicalName

   $RDMInfo.VMName = $vm.Parent
   $RDMInfo.DiskType = $vm.DiskType
   $RDMInfo.ScsiCanonicalName = $vm.ScsiCanonicalName

$myTable += $RDMInfo
}

$myTable |Export-csv -NoTypeInformation $csvfile

# Finished creating csv file. Now filtering out RDMs that are not part of MSCS by removing RDMs that do not have duplicates.

$duprdms = Import-Csv $csvfile | Group-Object ScsiCanonicalName -noElement | where {$_.count -gt 1}

# Now setting MPP and the Perennially Reserved option on RDMs where this has not been done yet.
# This is an extra check because this script is run multiple times during a disaster recovery test.

ForEach ($esxihost in (Get-Cluster $cluster | Get-VMHost)){
   $myesxcli = get-esxcli -VMHost $esxihost
   ForEach ($rdm in $duprdms){
      $rdmdisk = $rdm.Name
      $scsilun = Get-ScsiLun -CanonicalName $rdmdisk -VMHost $esxihost
	 Write-Host "Evaluating $rdmdisk on $esxihost"
         $mpp = $scsilun.multipathpolicy
         Write-Host "MPP is $mpp"
         if ("$mpp" -ne "MostRecentlyUsed"){
         # Set Perennially Reserved flag to true
         $myesxcli.storage.core.device.setconfig($false, "$rdmdisk", $true)
         # Set multipathpolicy to MRU
         $scsilun | Set-ScsiLun -multipathpolicy "MostRecentlyUsed"
      }
   }
}

# Disconnect from vCenter
Disconnect-VIServer * -Confirm:$false

# Send last 10 errors to logfile
$allerrors = $error[0..9]

# Preparing info for email
$subject = "Result: $scriptname : Recoveryplan: $recoveryplan in $recoverymode mode"
$info = "These are the last 10 errors: $allerrors"
Send-Email $subject $info

# Remove logfile after it has been sent by email
Remove-Item $csvfile
</code>