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 AT VM.MARIST DOT EDU] On Behalf Of
Cowen, Richard
Sent: Friday, June 17, 2011 8:15 AM
To: ADSM-L AT VM.MARIST DOT 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 AT VM.MARIST DOT EDU] On Behalf Of
PAC Brion Arnaud
Sent: Friday, June 17, 2011 3:11 AM
To: ADSM-L AT VM.MARIST DOT 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
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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.brion AT panalpina DOT com
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-----Original Message-----
From: ADSM: Dist Stor Manager [mailto:ADSM-L AT VM.MARIST DOT EDU] On Behalf Of
Tim Brown
Sent: Thursday, 16 June, 2011 21:50
To: ADSM-L AT VM.MARIST DOT 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: tbrown AT cenhud DOT com <<mailto:tbrown AT cenhud DOT com>>
Phone: 845-486-5643
Fax: 845-486-5921
Cell: 845-235-4255
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