Help to try to speed up the Get-HDD ScsiCanonicalName

I'm working on a small script that will eventually be used to delete ROW, but for the moment only for testing purposes, I call you only Get-hard drive.

My current code is as such:

Get-disk hard - VM $vm DiskType - RawPhysical |  where {$_.} {ScsiCanonicalName - eq $i.GKUUID}

where $vm is an object of a previous call to get - vm and $i.GKUUID is the naa # from a CSV file.

I'm sure that my slow descent is from this line, even when all of the CSV file contains RDMs leave as a single virtual machine, so that get - vm is called only once, the script takes much longer.

I'm pretty new to powerCLI in general, so I hope it's a faster way to find the hard drive.

Here is the information that I have provided with:

Action GKUUID GKHostDeviceName ESXCluster GKDeviceName ArrayName ServerName

Delete "vm" 00000000000000000000000000000000 "cluster name" vmhba:CX:TX:LX 0000 0000-VMAX-X \\.\PHYSICALDRIVE34


Thank you

Hello, trevor12087-

One thing that comes to mind is how you receive information from the hard disk for the given virtual machine.  It seems that you call Get-hard drive for each line of the CSV.  You could optimize things by calling this cmdlet less time (for example, once a VM).  Then, store the hard disk of the virtual machine objects in a table, and _then_ get the info you want on each hard drive (disc name found by ScsiCanonicalName).  Who will be a more code (for example, action of group-object), but should result in a more rapid overall performance.

But, your desire to speed up Get-hard drive, or expedite at least to get the info of the disk hard as you want, reminded me that we at vNugglets has written such a function earlier.  This function gets Info for 'ordinary' VM - both for the virtual disks hard disks for RDM (including the ScsiCanonicalName).  So, I posted now the function to get the disks in VM and RDM using PowerCLI.

This feature will allow in your case - not by speeding up the hard drive Get, but by eliminating the dependence on it (do not use at all).  You can use the function to get drive information you want / need and with a significant speed increases.  For example, I tested against a particular VM with RDM:

method of retrieving disk information run duration
Cmdlet Get-hard drive ~ 26 s
Function get-VMDiskAndRDM of vNugglets.com ~2. 2 s

Thus, about 10 x performance increase - nice!  And that's without rewriting as indicated above in paragraph 0.  You can also increase performance by only calling the function once per VM.

Anyway, you can read all about this function at, once again, get drives of VM and RDM using PowerCLI.  How does do for you?

Tags: VMware

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