Political multi-channel Fixed and enter preffered paths balance for a set of RDM Lun

Hi all

I was hoping that someone with some experience PowerCLI might help me with the following problem.

Short version:

I need to adapt this script http://vmjunkie.wordpress.com/2009/01/29/balancing-lun-paths-on-your-esx-hosts-with-powershell/ to accept the entry of a canonical name text file...

Long version:

We have a number of LUNS of RDM used by Microsoft the Failover Clusters, in accordance with the recommendation from the storage provider (Dell), we need to define all teas LUN to have a multi-path of FIXED policy and want to balance these on both paths.

I can get the canonical name for each LUN RDM using this script;

Get-VM-Location"Cluster Name" | Get-HardDisk -DiskType "RawPhysical","RawVirtual"| SelectParent,Name,DiskType,ScsiCanonicalName
I then manually identify the LUNS that have to be changed since the text output.  So, basically, I have a text file containing the canonical each of the RDM LUN name I need to change to fixed.

LUNS.txt

NAA.6000d31000331e0000000000000000c0
NAA.6000d31000331e0000000000000000c1
NAA.6000d31000331e0000000000000000c2
NAA.6000d31000331e0000000000000000c3
NAA.6000d31000331e0000000000000000c4
NAA.6000d31000331e0000000000000000c5

I can't run this command to set the Fixed multichannel strategy because I need the PreferredPath variable.

Get-vmhost 'host name ' | Get-scsilun 'naa.6000d31000331e0000000000000000c0 ' | game-scsilun - multipathpolicy 'Fixed '.


"If the MultipathPolicy parameter is set to 'Fixed', you must specify the parameter of PreferredPath."

I can then get the paths by using this command:

Get-vmhost 'host name ' | Get-scsilun 'naa.6000d31000331e0000000000000000c0 ' | Get-scsilunpath

Favorite SanID state name
----       -----                                    -----      ---------
FC.2000... False Active 50:00:D3:10:00:33:1e:19
FC.2000... False Active 50:00:D3:10:00:33:1e:1 has

Basically, I need to adapt this script (from here http://vmjunkie.wordpress.com/2009/01/29/balancing-lun-paths-on-your-esx-hosts-with-powershell/) at the entrance to a text file of canonical names.

# Cluster-wide LUN Path Load Balancing Script
# Written by Justin Emerson, http://vmjunkie.wordpress.com
# Idea originally from a PERL script I saw here:
# This script requires the VI Toolkit version 1.5
# NOTE: This script assumes that every LUN has the same number of paths.
#       If you have multiple storage arrays, and they have different numbers of paths,
#       I make no guarentees that this will work!
# If you have an improvement to this script, please feel free to leave a comment on my blog!
Write-Host"This script will modify the policy of all your shared LUNs on all ESX Servers"-ForegroundColorCyan
Write-Host"in a Cluster to Fixed and select a preferred path in a round-robin fashion."-ForegroundColorCyan
if ($args.Length -eq0) {$clusterName= Read-Host"Please enter the Cluster name"} else {$clusterName= $args[0]}
$VMHosts= Get-Cluster$clusterName| Get-VMHost
# Run through this loop for each host in the cluster
foreach($VMHostin $VMHosts)
{
    # Keep only disks of luntype "disk" to avoid any storageArrayController devices.
    # Filter to only objects where the ConsoleDeviceName starts with vml to avoid any DAS disks.
    # Note: I have tested both HP EVA and Xiotech storage and SAN LUNs always appear this way.
    # Please check if this is the same on your storage before running.
    $luns= $VMHost|get-scsilun-luntypedisk|
    where-object{$_.ConsoleDeviceName -like"/vmfs/devices/disks/vml*"}|Sort-ObjectCanonicalName
    $firstLUNPaths= Get-ScsiLunPath$luns[0]
    $numPaths= $firstLUNPaths.Length
    $count= 0
    foreach($lunin $luns)
    {
        if ($count-ge$numPaths) { $count= 0 }
        $paths= Get-ScsiLunPath-ScsiLun$lun
        $lun|Set-ScsiLun-MultipathPolicyFixed -PreferredPath$paths[$count]
        $count+= 1
        # Sleep for 30 seconds as I've heard some arrays dont like doing this too fast.
        Start-Sleep-Seconds30
    }
}
Any help would be greatly appreciated.
See you soon,.
Patrick

Do you have something like this in mind?

$esxName = "MyEsx" $lunFile = "./luns.txt"
$lunNames = Get-Content $lunFile $VMHost = Get-VMHost -Name $esxName
# Find the LUN with the least number of paths
$leastLUNPaths = Get-ScsiLun -VmHost $VMHost -LunType disk | Sort-Object -Descending -Property {
  Get-ScsiLunPath -ScsiLun $_ | Measure-Object | Select -ExpandProperty Count} | Select -First 1 | Get-ScsiLunPath
$numPaths = $leastLUNPaths.Length
$count = 0 foreach ($lunName in $lunNames)
{
  $lun = Get-ScsiLun $lunName -VmHost $VMHost  if ($count -ge $numPaths) { $count = 0 }
  $paths = Get-ScsiLunPath -ScsiLun $lun  $lun|Set-ScsiLun -MultipathPolicy Fixed -PreferredPath $paths[$count]
  $count += 1  # Sleep for 30 seconds as I've heard some arrays dont like doing this too fast.
  Start-Sleep -Seconds 30}

Tags: VMware

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