Setting round robin policy via PowerCLI

Another quick PowerCLI script for today. We recently discovered that multiple hosts had datastores configured with fixed path that should have been configured as round robin.

After first verifying that a cluster did not contain any RDMs, this script goes host-by-host finding all Fibre Channel connected Datastores. It checks to see if each datastore’s multipath policy is configured for Round Robin, and if not, the policy is configured correctly.

$cluster = "cluster01"

# Check to see if this cluster has any RDMs
if ((get-cluster $cluster | Get-VM | Get-HardDisk -DiskType "RawPhysical","RawVirtual" | Select Parent,Name,DiskType,ScsiCanonicalName,DeviceName | measure).count -ne 0) {
    Write-Host -ForegroundColor Red "There are RDMs in this cluster. Skipping!"
} else {

    # Get an array of hosts in this cluster
    $hosts = get-cluster $cluster |Get-VMHost

    # For each host
    foreach ($vmhost in $hosts) {
        write-host "Proceeding with host $($vmhost.name)"

        $vmhost | Get-VMHostHba -Type "FibreChannel" | Get-ScsiLun -LunType "disk"|
                    where {$_.MultipathPolicy -ne "RoundRobin"}|Set-ScsiLun -MultipathPolicy RoundRobin

    }
}