Has anyone used the DD NFS mount point for Devclass type of File? If so to what degree?
How hard could you push it? 1, 2 or 3 TBH? (10Gige = approx 2.25TBH) We have a fairly robust backup server platform I ask as we like the idea of no tape / robot devices from OS to app layer(TSM). This thread is a great read! -----Original Message----- From: ADSM: Dist Stor Manager [mailto:ADSM-L@VM.MARIST.EDU] On Behalf Of Cowen, Richard Sent: Friday, June 17, 2011 8:15 AM To: ADSM-L@VM.MARIST.EDU Subject: Re: [ADSM-L] tsm and data domain Brian, The DD has dedup by volume. If you lookup the contents of a volume on TSM, you can get an feeling for how dedup varies. The resulting information is "approximate", due to the fact some of the data on a DD volume has "expired" from TSM's point of view, and will not show up in the volumeusage table (I don't think.) Also, the first copy of any "chunk" will have a dedup ratio of 1. filesys show compression /backup/vtc/*/* /backup/vtc/Default/N00022L3: mtime: 1302728324652916847, bytes: 47,868,905,726, g_comp: 47,521,219,818, l_comp: 8,403,079,871, meta-data: 154,714,124, bytes/storage_used: 5.6 Richard -----Original Message----- From: ADSM: Dist Stor Manager [mailto:ADSM-L@VM.MARIST.EDU] On Behalf Of PAC Brion Arnaud Sent: Friday, June 17, 2011 3:11 AM To: ADSM-L@VM.MARIST.EDU Subject: Re: [ADSM-L] tsm and data domain Tim, We are right conducting a POC with a pair of DD860, and are relatively satisfied with them. The machines are mostly used as VTL except for a small NFS partition which is used or TSM DB backups. Deduplication rate is OK : around 10 so far, with a good mix of Exchange, Oracle, DB2 as well as Win and AIX data. Ingestion rate is corresponding to our needs, slightly more than 1 GB/s , and the possibility to define plenty drives. Negative or "no so impressive" points, so far : deduplication rate is a "global" factor, impossible to know what type of data dedupes better than another one, thus lowering the granularity of deduplication monitoring . We also experienced pretty long initialization times for the TSM server attached to a virtual library having 100 drives : at restart TSM server needs at least 15 minutes to recognize all the drives, thus generating numerous client errors, as they try to get a drive which is defined but not available. We still have to experiment if defining more smaller libraries would solve that issue ... At least replication : it is still unclear for me what would be happening if we do rely on replication to replace copy storage pools, and if our TSM server crashes on primary site while replication is not completed. To my mind the virtual volumes contents would not be matching TSM DB content : not sure so far on how to handle such a situation ... Hope this helped ! Cheers Arnaud ************************************************************************ ****** Corporate IT Systems & Datacenter Responsible Panalpina Management Ltd., Basle, Switzerland, CIT Department Viadukstrasse 42, P.O. Box 4002 Basel/CH Phone: +41 (61) 226 11 11, FAX: +41 (61) 226 17 01 Direct: +41 (61) 226 19 78 e-mail: arnaud.br...@panalpina.com ************************************************************************ ****** -----Original Message----- From: ADSM: Dist Stor Manager [mailto:ADSM-L@VM.MARIST.EDU] On Behalf Of Tim Brown Sent: Thursday, 16 June, 2011 21:50 To: ADSM-L@VM.MARIST.EDU Subject: tsm and data domain Any one use emc's data domain devices for storage pools and replication Would like to here positive and negative issues. Thanks, Tim Brown Systems Specialist - Project Leader Central Hudson Gas & Electric 284 South Ave Poughkeepsie, NY 12601 Email: tbr...@cenhud.com <<mailto:tbr...@cenhud.com>> Phone: 845-486-5643 Fax: 845-486-5921 Cell: 845-235-4255 This message contains confidential information and is only for the intended recipient. If the reader of this message is not the intended recipient, or an employee or agent responsible for delivering this message to the intended recipient, please notify the sender immediately by replying to this note and deleting all copies and attachments. The information contained in this transmission may contain privileged and confidential information. It is intended only for the use of the person(s) named above. If you are not the intended recipient, you are hereby notified that any review, dissemination, distribution or duplication of this communication is strictly prohibited. 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