we have 2 hosts with 10 gig iSCSI links to SAN . (2 per host , jumbo frames enables , no teaming, isolated vlan)
We are receiving reports of slow read speeds (at the VM level) after upgrade.
What is the best / most accurate way that i can measure the throughput of the VM to the SAN?
Are you sure that jumbo frames are enabled at the physical switch?
It´s normal to enable jumbo frames in vswitch but no in physical switch
The most common is using the esxtop command
See this kb and try it