Hi Wolfgang, I'd recommend looking into the following parameters for AIX/TSM in your server options file:
AIXASYNCIO YES AIXDIRECTIO YES MIRRORWRITE DB PARALLEL Good luck- John -----Original Message----- From: ADSM: Dist Stor Manager [mailto:[EMAIL PROTECTED] Behalf Of GWDVMS::MOELLER Sent: Wednesday, December 03, 2003 3:02 PM To: [EMAIL PROTECTED] Subject: TSM database write performance (TSM server 5.1.6.5 on AIX 5.1 with essentially standard options) >From observing DSMSERV's I/O behaviour via "topas", I get the impression that it *writes* to the database volumes (currently 14 files each covering a whole JFS-mirrored SSA disk) in essentially single-threaded fashion, i.e. never exceeding the I/O rate that you would expect from a single disk. This is quite different from the *read* behaviour, where many disks (= DB volumes) are being used in parallel. Is there some tuning option that would allow for a higher write I/O rate, or is the sequential processing of writes fundamental to TSM's database operation? I didn't find anything pertinent in the "Quickfacts" ... What write I/O rates do you see? Wolfgang J. Moeller, Tel. +49 551 201-1516/-1510, [EMAIL PROTECTED] GWDG, D-37077 Goettingen, F.R.Germany | Disclaimer: No claim intended! http://www.gwdg.de/~moeller/ ---- <[EMAIL PROTECTED]> ---- <[EMAIL PROTECTED]>