SMBIOS VM UUID

Hi guys,.

I am trying to automate our CMDB with automatic updates, so we get an accurate billing based on the CMDB instead of various exports of various VC CSV files.

Because the virtual machines haven't really a serial number of an ID unique I wanted to fill a UUID persistent instead and then preferably UUID used by the operating system also for consistency.

I had the idea of Alans blog post in December and figured VM SMBIOS UUID ($_.extensiondata.) Config.UUID) fits over description.

He writes that the ID must be maintained during migration and that it is the UUID that is visible to the guest OS.

I have now come to full scale stable and noticed that some VMS changes this UUID from one day to the other, and I wonder what may be the reason.

We have not cloned them or anything like that, but we use fully automatic DRS and Netbackup with snapshot backup option.

It fits to the random model of what could be the result of a migration of DRS, but when the migration manually it seems to have kept the UUID, so I wonder if this may be due a virtual machine has been migrated and amplified to be so on a new ESX that generates a new UUID, or is it because he has migrated to an ESX where UUID is already used by another virtual machine (I think to) what Alan wrote: "This UUID is generated by the server ESXi for vCenter doesn't have to be in the control flow for the uuid.bios generating.")?

What could be the reason for the change of the UUID?

What would be the more static UUID to use in a CMDB? Or it is generally a bad idea?

Thanks for the tip Luc, was an interesting read, but I'm a little embarrassed to say that I think that I was a bit hasty in the creation of this post.

When we look deeper in my logs (must love Start-Transcript) and verified exactly what virtual machines it was touching I noticed that some of the VM, which was cloned and renamed incidents and the other was VMs in double where it was powered and had name of capital LETTERS and one has been turned off and name of tiny. Since the CMDB is not case sensitive we had only one record in the CMDB, but I use a foreach statement to complete Get - VM, so he changed for the second virtual machine.

My apologies, but the deadline is approaching, so I was a little quick on the establishment of this post.

Tags: VMware

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