Re: [ADSM-L] vtl versus file systems for pirmary pool
2011-09-26 16:36:19
The one drop-dead difference is that if you want to do LAN-Free, the target has
to be a tape (or tape-emulating) device.
Can't use TSM filepools.
If you replicate between VTL's, it's transparent to TSM, but you have to have
the same vendor hardware at both sites.
Dedup may also be faster with a VTL, if your VTL does it in-line.
Also a VTL is often quicker to set up (which doesn't necessarily mean it is
easier to maintain, if you consider firmware updates, multiple maintenance
contracts, etc.)
TSM 6.2 has to dedup as part of the reclaim process, post-data-landing-there.
That isn't necessarily a bad thing, it's just a different way.
To get replication of the deduped data, you have to set up a second/copy pool
yourself; but it does not have to be the same hardware on both ends.
There is nothing about having a VTL/VTL gateway that inherently means you can
do fewer concurrent backups than with a TSM filepool, depends on your
hardware. You can have a fast VTL or a slow crappy VTL, just depends on what
you pay for...
-----Original Message-----
From: ADSM: Dist Stor Manager [mailto:ADSM-L AT VM.MARIST DOT EDU] On Behalf Of
Tim Brown
Sent: Monday, September 26, 2011 4:05 PM
To: ADSM-L AT VM.MARIST DOT EDU
Subject: [ADSM-L] vtl versus file systems for pirmary pool
What advantage does VTL emulation on a disk primary storage pool have
as compared to disk storage pool that is non vtl ?
It appears to me that a non vtl system would not require the daily reclamation
process
and also allow for more client backups to occur simultaneously.
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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