Tag Archives: portgroups

Check VMware Configuration with Powershell

I have promised you I would post this script, so here it is!

This Powershell script generates an overview of any items that are not available to every ESX server in a VMware cluster. These items might prevent your vm’s being vmotioned by DRS or restarted by HA. Pretty serious business, I’d say!

The items involved are:
1. datastores
2. LUNs (important when using Raw Device Mappings)
3. port groups

The output is a nicely formatted HTML page showing not only which items are misconfigured, but also where the are available and where they are absent.

Here’s an example:
Compare Screenshot

And here’s the script:
Compare-Clusters (Rename to .ps1)



Compare ESX configurations with Powershell

One of the challenges in managing a large VMware Infrastructure is keeping all ESX Servers within a cluster equal. This is essential for having vmotion capabilities and therefore essential for a solid HA configuration. I have showed you earlier how to add the LUN Count for each ESX Server to your VI Client. This allows you to spot differences quickly. But finding exactly which datastores are missing on which ESX Server can be a bigger challenge.

Here are some small functions that can help you determine where the major differences are.

Comparing datastores:

function Compare-VMHostDatastores
$a = Get-VMHost $host1 | Get-Datastore | %{$_.Name}
$b = Get-VMHost $host2 | Get-Datastore | %{$_.Name}
Compare-Object $a $b

Compare-VMHostDatastores esxServer1 esxServer2

InputObject                         SideIndicator
———–                                ————-
esxServer1_Local             <=
esxServer2_Local             =>
DATASTORE_TEST1         =>

And comparing Port Groups:

function Compare-VMHostPortgroups
$a = Get-VirtualPortGroup (Get-VMHost $host1) | %{$_.Name}
$b = Get-VirtualPortGroup (Get-VMHost $host2) | %{$_.Name}
Compare-Object $a $b

Compare-VMHostPortgroups esxServer1 esxServer2

InputObject                SideIndicator
———–                      ————-
PortGroup_TEST     <=
Internal                       <=

Maybe you prefer to go the other way around and check to which ESX servers a specific datastore is attached?

function Get-DatastoreHosts
Get-VMHost -Datastore (Get-Datastore $datastore) | Sort Name | %{$_.Name}

PS D:Scripts> Get-DatastoreHosts DATASTORE_TEST1


Thank Microsoft for Powershell and the Compare-Object cmdlet!