Upgrading to ESXi 5.0? How to confirm VAAI status?
anthonyv 2000004B9K Comments (5) Visits (15054)
I am getting this question on a very regular basis:
"We have just upgraded to ESXi 5.0 but we cannot find the VAAI driver on the IBM Website"
The answer? There is no vendor supplied driver because no driver is needed. ESXi 5.0 uses a SCSI T10 compliant set of commands that all vendors need to support for VAAI to work.
But of course in the tradition of all answered questions, it leads to another question:
"Once I have upgraded to ESXi 5.0 how can I tell if VAAI is really working?"
The good news is that it is very easy to spot if ESXi 5.0 has detected a VAAI capable LUN. The moment a new LUN is detected by ESXi 5.0 it tries out an Atomic Test and Set command. If that works, you will see that Hardware Acceleration shows as Supported in vCenter. In the screen capture below I have three datastores, two from XIV and one from Storwize V7000, all presented to an ESXi 5.0 server. I dragged the Hardware Acceleration column over from the right hand side to help with the screen capture (in case your vCenter looks different), but you can see the Hardware Acceleration column shows each DataStore as Supported (and did so the moment the volume was detected).
Of course having seen the Hardware Acce
For more examples of how to test VAAI, check out section 9.5.5 Testing VAAI, in the new XIV IBM Redbook draft, XIV Storage System: Host Attachment and Inte
It documents the following tests:
The tests can be performed regardless of whether you have an XIV (on code levels 10.2.4a and above) or a Storwize V7000/SVC (on code levels 220.127.116.11 and above).
If upgrading to ESXi 5.0 with IBM Storage, please also be aware of the following knowledge base articles regarding VAAI support with IBM Storage: