I've got a VM that's performing poorly on IO. I dig in with esxtop on the datastores (all NFS mounted) and I see that there's a surprising gap between DAVG/rd and GAVG/rd: like 15 vs 56. It's an NFS mounted datastore, so there is no information in esxtop about KAVG/rd (which I was told should account for that gap between DAVG and GAVG).
Any suggestions on where to start looking?
You say there is a difference, but whats the numbers? Look at ESXTOP - Yellow Bricks | Yellow Bricks for a good reference
For example, I might see a DAVG/rd of 15 and a GAVG/rd of 56.