We use a simple IOMeter test to make sure two things are happening.
First make sure your NCM software is installed.
Second perform a 4K 100 write test on a 1000000 block file on your nimble storage, Set outstanding IO's to 16, Burst to 2. The array should show your hitting 18,000 IOPS.
If you have multiple 10GB connections, go to the Nimble array, monitor, interfaces. Make sure 50% of the traffic is on each interface. If not you have a MPIO issue.
The run a 512K block write test with the same settings but this time 100 reads. The array should read at about 800 MB/s. Again monitor the interface for 50/50 load.
If your not seeing this - call support to figure out MPIO.
the other things I heard cause performance issues is trunking your iSCSI NICs - Don't trunk the iSCSI!!!
Hi Kevin, thanks for helping me out. I've never used iometer before and am having difficulty working out where to make the settings you mention. Could you describe in which pane you make these changes?
I've checked the port config on the Meraki switch and it looks like we do have it set to trunk rather than access. Can this setting be changed on a live system or do I need to shut it down?