I have a production AGS 10.2 site that has two servers in the cluster and utilizes a shared storage location for it's directories (config-store, caches, etc...). We used to have that storage space on a netapp NAS. Recently we had to move our storage to a Windows Server/Compellent based "SAN" and we are experiencing performance issues with our cached map services rendering in a timely manner. On the netapp, we would see individual consistent tile request through render times of less than 400 ms. Now, on the SAN, we are seeing huge variability... from <200 ms to over 3000 ms.
After talking with one of our sys admins, he suggested seeing if esri has any documentation on how to setup a SAN for best performance... things like formatting the disk into x block sizes, turning off compression, etc...
If anyone knows of such documentation or has any knowledge in this area, that would be great.