I recently migrated all of my VMware LUNs from an IBM XIV to an 8020 and now I am getting 'Virtual machine total disk latency' alerts from VMware. I did not get these when running on XIV.
I am monitoring my 8020 with the OnCommand Plugin for Microsoft in SCOM and I'm not getting any latency alerts from SCOM.
'statistics start -sample-id lun_stats -object lun' is showing LUN latency in microseconds, so there doesn't appear to actually be a performance issue with the 8020.
Is there some tuning I need to do in VMware (I have VSC installed), or are these VMware alerts just unreliable? If so, any thoughts on why they were occuring with the XIV?
