On Friday, Jul 9, 2004, at 01:36 Australia/Sydney, [EMAIL PROTECTED] wrote:
==> In article <[EMAIL PROTECTED]>, Gordon Woodward <[EMAIL PROTECTED]> writes:
Best recommendation: try to keep your volumes on a 1:1 basis with your physical spindles. It's the best possible way to convey to TSM what the architecture of your underyling disk is.
With any disk and controller technology that supports command queuing (SCSI2 command tagged queuing, SATA Native Command Queuing (NCQ)), you are better off with about 3 volumes per spindle for random I/O. TSM serialises I/O per volume, meaning only one I/O in flight to each volume at any one time.
This is backed up by tests I've run, and is recommended by one of the IBM TSM support guys here in Australia.
Cheers, -- Paul Ripke Unix/OpenVMS/TSM/DBA I love deadlines. I like the whooshing sound they make as they fly by. -- Douglas Adams
