What you do not want is the heads jumping all over the disks servicing many different files (TSM Volumes). You have received many responses on this question.
My lean would be to stripe the database either RAID1 or RAID5 on a given set of volumes across both arrays (depends on you IO activity). The reality is the database does not have that much write activity. It is mostly read except during expiration. For the storage pools disks I would try to use 1 physical disk per volume and go RAID1, TSM Mirroring, (RAID0 if you can deal with the non protection). Or a RAID-5 if you need the space and use a JFS file system. Others have better experience with this than myself. I have IBM ESS with a non-volatile cache, so it is a different ball game. You may want to try several things to see what works for you best. Paul D. Seay, Jr. Technical Specialist Naptheon Inc. 757-688-8180 -----Original Message----- From: Mahesh Tailor [mailto:[EMAIL PROTECTED]] Sent: Thursday, September 26, 2002 8:54 AM To: [EMAIL PROTECTED] Subject: Disk volumes Hello, TSM: 5.1.1.6 OS: AIX 4.3.3 Machine: IBM 6M1 Hopefully this is a simple question: I have fourteen 36GB drives that are available for the diskpool and I was wondering whether it is better to have seven 5GB files or three 10GB files or one 35GB file or something else? The drives are mounted in two IBM-2014 Ultra-Wide SCSI disk drawers with separate Ultra-Wide contollers. The other 14 drives are used for DB, LOG, and spare. Thanks. Mahesh