We have been having some issues lately with disk performance in our VMware cluster. Our setup is as follows:
- 3 Dell R610's running ESXi 5.1
- 2 Juniper gigabit switches with 3 VLANs (1 for management, 2 for iSCSI)
- 1 dual controller Dell MD3000i
After troubleshooting for a while, I found I could use SMcli to monitor the performance of the SAN. Upon doing so, the results were somewhat surprising as it looks like one of our controllers seems to be completely inactive. I have taken a screenshot of the results: (Ignore the name of the storage array. It was previously used in a XenServer setup)
My question is, how do I get it to where both controllers are acting as a pair for best performance. I would think there should be some way to have the VMware hosts take the quickest path to either controller to get to the disk, is there not?
Any help would be greatly appreciated as this has stumped me for quite some time and searching the internet hasn't gotten me very far.