We are having problems with some of our Linux VMs going read only and Windows VMs slowing right down on our P6000 EVA. The problem tends to appear during a backup window, but sometimes during the working day under heavy periods of activity. It seems to be storage performance related. ESXi 5.1 is using round robin and there are no network issues.
Has anyone tried these advanced ESXi settings which are reported to improve performance?
(From: http://arritdor.e-wilkin.com/2012/05/vmware-esxi-and-hp-3par-storage.html)
DiskMaxIOSize = 128
QFullSampleSize = 32
QFullThreshold = 4