I'm performing SQLIO tests on a CS220, configured iops=0 an bytes=0, 4 x 1G interfaces on both Nimble and ESX, NO Jumbo Frames, and connecting to a CISCO 3750 stack. I am receiving expected results in IOPs numbers with exception of Random Read. Can you post your Cisco interface port configs for the Nimble and also for iSCSI? Ex..."flowcontrol received desired"..."spanning-tree portfast"...etc. And did you enable Jumbo Frames? Here are my results:
MySQL IO Test
Volume: VMFS 5 4K
Random Writes: ~35,000 IOPS / ~275 MB/sec
Random Reads: ~21,000 IOPS / ~160 MB/sec (low numbers...expecting higher numbers in the ~40,000+ much like Shawn Peters)
Seq Writes: ~20,000 IOPS / ~160 MB/sec
Seq Reads: ~6,600 IOPS / ~419 MB/sec
Why are the Random Reads so low? Should the numbers be up in the 40,000+? Any help is appreciated?