Hi David, o.k. I understand. But my question was related (sorry about my english)to the fact, as far as I understand, that a single file isn't broken into peaces and stored on multiple volumes at the same time (simultaneous) for performance reasons. I got a little bit confused about multi session clients, number of mountpoints and so on. regards Michael -----Ursprüngliche Nachricht----- Von: David Longo [mailto:[EMAIL PROTECTED]] Gesendet am: Montag, 19. Februar 2001 19:14 An: [EMAIL PROTECTED] Betreff: Re: Performance point of view When going to sequential drives, a single migration process will sequentially store files on ONE volume until it is filled (or a I/O error occurs on tape) and then proceed to the next tape. One large (or not so large) file can and will span multiple volumes if EOT is reached on a tape and the file has not been completely copied/migrated. I have seen this happen many times (TSM server 3.7.4.0 is out current). Thus a file, regardless of size is attempted to be put on as few tapes as possible. I believe this is the same for collocation, but don't use collocation here. David B. Longo System Administrator Health First, Inc. 3300 Fiske Blvd. Rockledge, FL 32955-4305 PH 321.434.5536 Pager 321.634.8230 Fax: 321.434.5525 [EMAIL PROTECTED] >>> [EMAIL PROTECTED] 02/19/01 12:59PM >>> Hi all, I would like to get some help/infos/ideas for better understanding the performance point of view. If some clients are backed up into a disk storage pool, the data (files) from this storage pool will be migrated into the next storage pool (type sequential for example) if watermarks are reached. During this migration the files are stored at the end of the chain "storage pool" -- "device class" -- "library" -- "drives" to drives, to all available drives I assume and isn't collocation enabled all files are distibuted over the volumes, but no single file is spread out over the volumes. This means to me, that one huge file would be stored to just one drive, even if many drives available, correct ? As far as I know about TSM it is different in the TDP for SAP, there I can stream to different tapes, but what about TDP for Oracle and how can I manage to get a huge file saved as fast as possible? many thanks for your help regards Michael "MMS <health-first.org>" made the following annotations on 02/19/01 13:19:20 ---------------------------------------------------------------------------- -- 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. ============================================================================ =
