VMFS UUID numbering explained

Following a post from Eric Gray which I found a bit harsh but so true. No need to say VMFS volumes have also such GUID (aka UUID) that are just undecipherable…really! you sure? 

All VMFS Volumes have a UUID number. Those are then linked to a Datastore name, like : Datastore001. When you do a ‘ls’ from the service console in /vmfs/volumes you should see the names of your datastores linked to the UUID number. But more on the UUID number.

The number is as follow : 123abc98-12abc456-bd12-000569ab56bf

This is what what it means :

  • 123abc98 : This is the console time at VMFS creation or when it was resignatured
  • 12abc456 : TSC time (This is the CPU time stamp counter)
  • bd12 : A Random number
  • 000569ab56bf : The Service Console MAC address that created or last updated the UUID

Note that I have just used random hex numbers for the UUID number above.

Source: Vroem.co.za


About PiroNet

Didier Pironet is an independent blogger and freelancer with +15 years of IT industry experience. Didier is also a former VMware inc. employee where he specialised in Datacenter and Cloud Infrastructure products as well as Infrastructure, Operations and IT Business Management products. Didier is passionate about technologies and he is found to be a creative and a visionary thinker, expressing with passion and excitement, hopefully inspiring and enrolling people to innovation and change.
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5 Responses to VMFS UUID numbering explained

  1. santhosh says:

    That was ultimate explanation
    i really searched half the world

  2. deinoscloud says:

    Thx to Hugo Strydom, the source of my post…

  3. Juan says:

    Hi Deinos, good information. But how the VMFS signature comes to play here, are they related at all?

    From what I understand the signature is made with the device serial number + LUN number, so is the VMFS UUID independent of these parameters?


  4. soheil says:

    Thnx for your effort!

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