So - you have a new array and want to make sure VAAI is working?
- Open up a SSH session to your ESX host upon which the VM you want to test is running
- Run "esxtop"
- Press "u"
- Press "f"
- Press "b,f,g,i,o"
- Drag your session window wider so you can see all the columns
- Start a storage VMotion in a supported fashion from your array vendor
- Look for the CLONE_RD, CLONE_WR statistics on the datastore(s) in question. If VAAI is working correctly, these numbers should increment
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