RAID 10 vs RAID 5: Performance, Cost, Space, and HA
DISCLAIMER: I am not a SAN storage expert but I have spent a lot of time looking into SAN storage systems from the business side and I thought I'd share some of my conclusions.
It seems that the proverbial question is how to balance the performance, cost, usable space, and availability of a storage solution. Any DBA will ask you to give him RAID 10 on small fast disks. Anyone paying the bills will ask "Why can't I use half the disks I bought?"