How are TSM admins using SATA disks for cache pools ?

What type of SATA disks are being used and at what raid levels ?

How satisfied are you with the backup times with SATA disks for cache pools
on TSM ?

We are looking at SATA for TSM cache pools is why the questions because
we are using enterprise class storage for cache pools on TSM currently at a
high cost.

Looking for cheaper disks for TSM cache pools.
Thanks

Justin Case
TSM Administrator/Storage Administrator
IT Analyst  OIT Infrastructure Support
334 Blackwell Street
2nd floor  Suite 2108 Durham,NC 27701
Duke University
Email: justin.case AT duke DOT edu