I heard a myth that you shouldn't use write caching on your SAN volumes if you expect a high number of writes. Has anyone had experience with this? My particular setup is an IBM DS4800 with several different LUN's, all of them are RAID 0+1, the primary file group is split into 4 different files spread across 4 different LUN's, and the log volume resides on a single RAID 0+1. tempdb is also on it's own LUN. The drives are 300 GB fibre channel. Each LUN has 4 drives. The server is 64-bit SQL 2005 Enterprise.