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
Edward L. Haletky, aka Texiwill, is an author, analyst, developer, technologist, and business owner. Edward owns AstroArch Consulting, Inc., providing virtualization, security, network consulting and development and TVP Strategy where he is also an Analyst. Edward is the Moderator and Host of the Virtualization Security Podcast as well as a guru and moderator for the VMware Communities Forums, providing answers to security and configuration questions. Edward is working on new books on Virtualization.