This past week we completed the migration of our vSphere 5 environment over to new hardware and while most things are quite a bit faster snapshots are horribly slow now.
All nodes before and after the migration were running vSphere 5 Update 1.
Old hardware:
DL380 G5, dual x5450, 64GB ram, 2xquad-port gigabit nics + onboard gig (4x for iSCSI SAN, 4x for Data, and 2x for Service Console & vMotion)
New hardware:
DL380p Gen8, dual E5-2690, 256GB ram, dual-port 10GB LOM and dual-port 10GB add-on card (2x for iSCSI/Service Console/vMotion and 2x for DATA)
The SAN configuration is a HP Lefthand P4500 cluster which has not changed during this process other than the migration to a 9000 MTU.
The network path follows DL380---(2x10GB iSCSI)--->Switch--->SAN Cluster(2x1GB per node)
Snapshots as a whole use to take under 40 seconds to complete with the old hardware and now take 2 to 5 minutes....merging is taking about the same magnitude of time more during the action. The other oddity I've noticed is that during the time a snapshot is taken pings to the given VM jump from <1ms to somewhere between 200ms and 500ms.
