Hi all, Windows 2000 TSM server 5.2.1 clients 5.1 -> 5.2 Domino 6.0.3 soon to be 6.5.4
I'm in a bit of quandry, and I would like another angle on it. The best performance I can squeeze out of our Domino backups is 10MB/s, where normal backups over the same network reach 40 MB/s. A quarter of the speed of normal backups! That's pretty terrible.. We have 2 domino servers which backup their txnlogs every 3 hours during the week. Every weekend on Saturday at 20:00 we run full DB backups of both machines. When the backup starts there is usually only one drive (of the three) available, and since we don't have collocation on in the receiving pool, both sessions take hold of the one tape and take turns to write data to it. In all my years of working with TSM, I've never seen it do this before..but that's besides the point. Later on during the Domino backup, the other drives become free, and I'm pretty sure I saw a session leave the drive-being-shared-by-two-sessions and take it's own. Is anyone able to explain the process TSM goes through when it's deciding what to do in this kind of situation? At any rate, my backup speed of one-quarter the maximum possible speed, is not good and I would like to hear some suggestions about how I can go about reducing the time it takes to backup our 900GB Domino Servers - approx 13 hours. I've been through the 'backup to disk then migrate off to next-pool' motions, but am unable to acquire the disk I'd need. Soon we will have another drive to play with, so I will turn on collocation in the primary Domino tape pool and expect each session to take a drive. BUT, will this make any difference at all? I'm beginning to think that it's the actual size of the databases and txnlogs which is bottlenecking our performance - is the LTO2 drive going to be having a hard time stopping at the end of each txnlog/maildb and starting again for the next one? I'm not totally au fait with the ins and outs of the LTO mechanism, Thank for your suggestions, in advance. Regards, Matthew Aviva plc Registered Office: St. Helen's, 1 Undershaft, London EC3P 3DQ Registered in England Number 02468686 www.aviva.com This message and any attachments are confidential. If you are not the intended recipient, please telephone or e-mail the sender and delete this message and any attachment from your system. Also, if you are not the intended recipient you must not copy this message or attachment or disclose the contents to any other person.