My 3584 has FC-AL drives through McData ES-1000 switches to a RS6000 6H1 with the FC 6228 2 Gigabit Adapters.
Tape to tape I get about 115GB /hour and as you mentioned 2.5/1 or slightly better compression - compressing on tape only. David Longo >>> [EMAIL PROTECTED] 07/03/02 01:40PM >>> How much data was actually on the tape? If you got 2:1 compression, at 25% full, an LTO tape has 50GB of data on it. Over 4 hours that's 12.5GB/hr, which may not be too bad depending on the connection to the drives. And if, as I've seen, you get better than 2:1, say 2.5:1, you're looking at 63GB of data, or just over 15GB/hr. There are a number of factors that can go into the performance. Bandwidth, from the SCSI bus or SAN, the PCI bus the data is flowing over, the TSM database (was expiration running at the same time, causing the reclamation to kick off?), all kinds of things like that can slow down reclamation. Since you only have two drives, you may want to look at a reclamation pool. Granted, you'll need some DASD to do it - if you're tapes are holding 200GB and your reclamation threshold is 60%, you're looking at 80GB of data to reclaim a tape. But it would keep a drive free for user functions. Nick Cassimatis [EMAIL PROTECTED] Today is the tomorrow of yesterday. Guillaume Gilbert <guillaume.gilbert@DESJ To: [EMAIL PROTECTED] ARDINS.COM> cc: Sent by: "ADSM: Dist Subject: Reclaiminig LTO Tapes Stor Manager" <[EMAIL PROTECTED]> 07/03/2002 09:40 AM Please respond to "ADSM: Dist Stor Manager" Hey there Maybe its because I'm used to using STK 9840 tapes but yesterday I saw an LTO tape at 25 % utilisation take almost 4 hours to reclaim, which to me is awful. How am I supposed to reclaim my tapes with that kind of performance?. The drives I use are IBM Ultriums in a 3584 library. With only 2 drives it makes it hard for users to do restores... Are there any options I can change to make this go a bit faster. I know the start/stop on LTO's isn't good. Thanks for the help. Guillaume Gilbert CGI Canada "MMS <health-first.org>" made the following annotations on 07/03/2002 03:59:56 PM ------------------------------------------------------------------------------ This message is for the named person's use only. It may contain confidential, proprietary, or legally privileged information. No confidentiality or privilege is waived or lost by any mistransmission. If you receive this message in error, please immediately delete it and all copies of it from your system, destroy any hard copies of it, and notify the sender. You must not, directly or indirectly, use, disclose, distribute, print, or copy any part of this message if you are not the intended recipient. Health First reserves the right to monitor all e-mail communications through its networks. Any views or opinions expressed in this message are solely those of the individual sender, except (1) where the message states such views or opinions are on behalf of a particular entity; and (2) the sender is authorized by the entity to give such views or opinions. ==============================================================================