What data rates are you getting? What type of files are you backing up, big (over 1G), small (less than 50K), filesystem, databases? Is the TSM database on the same volume group as the diskpools? Is the data you are backing up on the same volume group as the TSM stuff? You could be destroying your disk cache hit ratio. Does the disk have any performance monitoring tools to look at this. How many paths do you have to the disk?
Paul D. Seay, Jr. Technical Specialist Naptheon Inc. 757-688-8180 -----Original Message----- From: Steve Freeman [mailto:[EMAIL PROTECTED]] Sent: Wednesday, July 24, 2002 12:01 PM To: [EMAIL PROTECTED] Subject: diskpool performance Please could someone advise me on the following issue we have with tsm. I am a TSM novice and would appreciate some pointers etc. Environment : TSM 4.2.0 AIX4.3.3 ML09 Server and Client on same Server using Sharedmem 2 Stgpools defined diskpool and tapepool we have created a diskpool on RAID5 and created random access volumes Total Diskpool size is 150GB. Our nextpool is tapepool for migration upon high thresholds being reached. We have compression turned off on the client and set the selftune parameters in dsmserv.sys SELFTUNEBUF SELFTUNETXN Issue: IF we initiate a client backup using sharedmem to the diskpool, it seems to take the same time as it does to backup the client straight to tapepool. I would have thought the diskpool access would be quicker ? The Diskpool is located on direct fibre attached storage with large read/write cache. The tapepool is SCSI attached ATL library with 2 drives Any suggestions or pointers to increase the throughput to a respectable level would be appreciated. kind regards steve freeman [EMAIL PROTECTED]