ADSM-L

Re: [ADSM-L] tsm and data domain

2011-06-17 08:34:10
Subject: Re: [ADSM-L] tsm and data domain
From: Richard Rhodes <rrhodes AT FIRSTENERGYCORP DOT COM>
To: ADSM-L AT VM.MARIST DOT EDU
Date: Fri, 17 Jun 2011 08:31:13 -0400
We just implemented a pair of DD880's.  Here are some thoughts/comments
about this implementation in no particular order . . .

- We like them a lot.
- Fairly straight forward system.  Did not go to training - just spent
time with the manual.
- The tsm servers are not real high performers, so they don't put a big
I/O load on the DD.
- The TSM servers are old Sun T2000.
- Each DD has both primary data for onsite TSM servers and DR copy for the
other.
- Used as NFS filepools using 30gb file volumes over 10g ethernet.
- We really like the NFS/Filepool setup.  It greatly simplified the TSM
environment and has worked very well.
- We kept the diskpool to front most backups, then run migrations to the
filepool.
- Big database backups that went straight to tape now go straight to the
filepool.
- We've seen  max throughput of about 180mb/s, and we believe this limit
is the Sun servers.
- We use DD replication - no copy pools.
- Because no copy pools, we use DD snapshots to protect from major logical
corruption.
- TSM db backups go to a separate small filepool on the DD.
- We keep the snapshots for 3 days, with 3 day tsm database retension,
with 3 day reuse delay.
- Data is a mix of Windows servers, Unix, and databases.
- During the RFP faze DD went with a 4.5 dedup ratio - we wanted to be
very conservative.
- Overall dedup ratio has turned out to be 8.5.
- Freed up space on the DD is made available for use by running a CLEAN
process.  This included the space used by old snapshots.
- DD recommends running CLEAN only once per week.
- In performing DR testing learned that TSM can't access a filepool via a
symlink.
- If interested and want more info than sales folks give, ask for a temp
account on the support site.
- Started conversion of the TAPEPOOL to DD FILEPOOL using reclamation.
Halfway throught we switched to MOVEDATA, which seemed to perform better.
- Took 8 weeks to move all the TAPEPOOL's of 3 TSM servers to DD
Filepools.
- Total footprint in the DD is 550TB (local primary + DR from other site)
stored on about 60TB of disk. (8x dedup)

Rick






From:   Tim Brown <tbrown AT CENHUD DOT COM>
To:     ADSM-L AT VM.MARIST DOT EDU
Date:   06/16/2011 03:54 PM
Subject:        tsm and data domain
Sent by:        "ADSM: Dist Stor Manager" <ADSM-L AT VM.MARIST DOT EDU>



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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