In my last post “IBM DS3400 Redundant Controllers and Bad Batteries, eNet Cable Fail” I realized that I badly configured my SAN from the start. So I bit the bullet and started a process to change the number of spindles per LUN to 11 of 12 disks, with the 12 disk being a hot spare. Performance on SAN LUN is directly proportional to the number of spindles in use by the RAID set and my old setup had 3 Disk LUNs instead of using virtual LUNs ontop of one larger physical LUN.
Now that I know how to configure this, I wanted to make use of the higher performance. To do this, I had to
- first offload all VMs from the SAN to some other storage by way of SVMotion
- backup any RDMs I have
- update the LUN layout of the IBM DS3400 to be 11 disks in a Raid 5 with virtual LUNs presented to ESX
- SVMotion the VMs to the new LUNs Continue reading vSphere Upgrade: Rearranging LUNs for Better Performance: Updated