Pretty new with using iSCSI in ESXi so I might very well do something fairly dumb...
I've setup a test rig with a "bare metal" FreeNas providing iSCSI storage to an ESXi server.
The iSCSI networking is done via a direct cable (no switch / VLAN) with two Intel I350 Gigabit NIC.
I created and fairly basic Windows VM and started to play around. Things seemed initially ok but as soon as I got into (relatively) heavy I/O (extracting a zip !) I got errors on the windows machine.
Looking into the ESX logs I see messages such as
00_________________ performance has
deteriorated. I/O latency increased from average
value of 5350 microseconds to 964280
Nothing obvious reported on the FreeNas side, though.
Any idea / suggestion how to diagnose this ? My initial feeling would point toward a networking issue ?!