Thanks for the numbers DG267.
I'd like to move to faster disk, but our catalog is c. 400 GB compressed to c.250 GB, and it's stuck on a NetApp 3070 active-active cluster being synchronously replicated over to another site by SnapMirror, and thus the LUN has to sit in a "trad vol", and thus we can can't waste spindles - so it's sitting in a 4D+2P parity group of 300GB 15k FC-AL disks. Ideally it would sit in a much bigger parity group, but... I keep thinking we should move the NetBackup master to our HP XP12000 arrays.