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April 11, 2022 01:18 am GMT

Automate Snapshots of Multiple VMs Concurrently Using PowerCLI

This is a PowerShell / PowerCLI script I wrote to automate snapshots of multiple VMs concurrently using PowerCLI. To prevent overwhelming vCenter, a limit specifies the maximum number of concurrent tasks.

Code

    $snapshot_name = "Example Snapshot Name"
    $snapshot_description = "Example Snapshot Description"
    $num_concurrent_jobs_limit = 8foreach ($vm in $vms) {    try {        New-Snapshot -VM $vm -Name $snapshot_name -Description $snapshot_description -Memory:$false -Quiesce:$false -RunAsync:$true -Confirm:$false -Server $vcenter_server    } catch {        Write-Host("Error creating snapshot for $vm on $vcenter_server.")        $ErrorMessage = $_.Exception.Message        Write-Host($ErrorMessage)    }    try {        $current_snapshot_tasks = Get-Task | where {$_.Name -eq 'CreateSnapshot_Task' -and 'Running','Queued' -contains $_.State}        while ($current_snapshot_tasks.count -gt $num_concurrent_jobs_limit) {            sleep 5            $current_snapshot_tasks = Get-Task | where {$_.Name -eq 'CreateSnapshot_Task' -and 'Running','Queued' -contains $_.State}        }    } catch {        Write-Host("Error getting snapshot tasks on $vcenter_server.")        $ErrorMessage = $_.Exception.Message        Write-Host($ErrorMessage)        exit    }}

Code Explanation

For each $vm in $vms, the script starts an asynchronous snapshot task that allows the script to continue without waiting for the task to complete.
A while loop implements a check/sleep cycle that fetches the number of running snapshot tasks, and sleeps if the number of tasks is greater than the limit.
When the number of snapshot tasks is less than the limit, the while loop exits, and the foreach loop progresses to the next VM.
The script outputs an error message if it cannot start a snapshot for a VM, and exits if it's unable to fetch the current number of snapshot tasks.

Resources

Original Link: https://dev.to/tomkanabay/automate-snapshots-of-multiple-vms-concurrently-using-powercli-4kk5

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