Eric, The issues we had when we had caching turned on were: 1. Fragmentation of the the diskpool which led to a general slowdown in processes. This can be minimized if you have a regular schedule of flushing the cache (turn it off and migrate down to zero). 2. TDP agents don't always play nice with diskpool using caching - some algorithim issue that doesn't free up a big enough block and then kills the backup when it runs out of room in the pool.
I'm assuming you are already multi-threading your stgpool backup and migration, so the only suggestions I can offer are; 1. buy more tape drives and increase the multi-threads 2. buy tons of cheap disk and implement file-based stgpools. This is the approach we took and it cut our total housekeeping elapsed time by 75%. Good luck! Steve Schaub Computer Storage Systems Engineer II Haworth, Inc 616-393-1457 (desk) 616-886-8821 (cell) [EMAIL PROTECTED] "Trials are inevitable. We can curse them and grow bitter, or harvest them and grow stronger" -----Original Message----- From: Loon, E.J. van - SPLXM [mailto:[EMAIL PROTECTED] Sent: Thursday, January 13, 2005 10:27 AM To: ADSM-L@VM.MARIST.EDU Subject: Enabling caching to shorten housekeeping Hi *SM-ers! I'm currently struggling with the fact that I cannot run a backup stgpool diskpool and a migrate diskpool (to empty it out for the next client backup cycle) sequentially no more. Migration would run well into the evening and I would like it to be ready at 18:00 hours. I'm thinking about turning on caching for my diskpool. If it works like I hope, TSM migration empties out the diskpool, but leaving the actual data behind, so a backup stgpool diskpool uses these cached copies, instead of mounting all the tapes during a subsequent backup stgpool tapepool. In that case, I can run migration and backup stgpool at the same time. Is TSM working like this or will a cached object, once (logically) migrated, be backed up from tape? Thank you very much for your reply in advance! Kindest regards, Eric van Loon KLM Royal Dutch Airlines ********************************************************************** For information, services and offers, please visit our web site: http://www.klm.com. This e-mail and any attachment may contain confidential and privileged material intended for the addressee only. If you are not the addressee, you are notified that no part of the e-mail or any attachment may be disclosed, copied or distributed, and that any other action related to this e-mail or attachment is strictly prohibited, and may be unlawful. If you have received this e-mail by error, please notify the sender immediately by return e-mail, and delete this message. Koninklijke Luchtvaart Maatschappij NV (KLM), its subsidiaries and/or its employees shall not be liable for the incorrect or incomplete transmission of this e-mail or any attachments, nor responsible for any delay in receipt. **********************************************************************
