Our main file server has been running on 7.2k SAS drives for the last 2 years. We have been close to running out of space, so we bought 4 new 15 drives and built a 2nd array on the system (HP DL185 G5, 12 slots) to move one DFSRoot over to the faster drives. When testing however I see no improvement in seek/save/copy times between the old 7.2k drives and the 15 drives.
Is there something I am missing. When testing other servers with 10k drives there is a noticeable difference? Do I need to move the OS over to the faster drives to see a difference?