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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
Categories: Uncategorized
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That was ultimate explanation
thanks
i really searched half the world
Thx to Hugo Strydom, the source of my post…
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?
Thanks.
Hi Juan,
The best VMware document I could find about VMFS UUID/Signature is the VMware® VMFS Volume Management available at http://www.vmware.com/files/pdf/vmfs_resig.pdf
Also another great blog post: Understanding VMFS volumes available at http://blog.laspina.ca/ubiquitous/understanding-vmfs-volumes
Rgds,
Didier
Thnx for your effort!