Category: Powershell

Quick powershell snippet time ! When you have a UCS Central instance with a number of domains, knowing what free slots you have available is quite useful – especially when you’ve got a smart hands service and won’t be racking new servers but instead having to communicate instructions.

In my time I’ve seen UCS Central used to manage geographically separate domains and a large number of domains across a small number of sites. When you get a new blade it needs to be put into a free slot, the question is where ?

The script below uses domain groups to separate out domains, but the code is formatted so it can be removed if they aren’t used.

Get-UCSCentralOrgDomainGroup -Filter { Level -ceq 1 } | % {
	$group = $_;
	Get-UCSCentralComputeSystem | ? { $_.OperGroupDn.StartsWith($group.Dn); } | % {
		$compute = $_;
		Get-UCSCentralChassis -ComputeSystem $_ | sort Id | select @{L='Group';E={$group.name}}, @{L='Domain';E={$compute.Name}}, @{L='Chassis';E={ $_.Id}}, @{L='Blade Count';E={(Get-UCSCentralBlade -Chassis $_).Count}}
	}
}

Apologies I don’t currently have any domains available to run this against to show you some sample output so I appreciate you’ll be trying this out blind. I hope that it meets your expectations !

I’ve uploaded this to my github in a script file so it can be run as you need it 🙂

Quick snippet on how to find the name of a service profile given the MAC address.

I found this useful as when troubleshooting ESXi locks, the MAC address of the locking host is shown and sadly not the name. Once I had the name I was able to continue debugging my problem 🙂

Get-UCSCentralServiceProfile | % { $h = $_.Name; $res = $_ | Get-UcsCentralVnic | ? { $_.Addr -eq "<MAC address here>" }; if ($res -ne $null) { Write-Host $h; } }

This will work with UCS domains not joined to Central (and having global service profiles) – change the code by removing the word “Central” from the cmdlets.

This is a quick snippet that allows you to retrieve UCS Blades that have SD cards – this might be useful in determining if your blades are ready to have an OS installed on them. These scripts assume you’ve already connected to your UCS Central or UCS Domain.

This will get the blades if you’re using UCS Central:

Get-UCSCentralBlade | ? { $blade = $_; $cards = Get-UcsCentralStorageFlexFlashCard | ? { $_.Dn.StartsWith($blade.Dn); }; return ($cards.Count -gt 0); } | select @{L='Domain';E={ (Get-UcsCentralComputeSystem -Dn $_.Dn.Substring(0, 16)).Name }}, ServerId, ChassisId, SlotId, Name, @{l="Cards";e={$cards.Count}}, OperState, Association,Discovery, Model, TotalMemory, LsDn | Sort Domain, ServerId

If you’re not using UCS Central, we modify the commandlets by removing the “Central” from them, and remove resolving the domain (because you’ll know what domain you’re running it against). The following (currently untested) should work:

Get-UCSBlade | ? { $blade = $_; $cards = Get-UcsStorageFlexFlashCard | ? { $_.Dn.StartsWith($blade.Dn); }; return ($cards.Count -gt 0); } | select ServerId, ChassisId, SlotId, Name, @{l="Cards";e={$cards.Count}}, OperState, Association,Discovery, Model, TotalMemory, LsDn | Sort ChassisId, ServerId