[Veritas-bu] Multiple retention in one pool
2007-02-26 14:32:00
Subject: |
[Veritas-bu] Multiple retention in one pool |
From: |
JMARTI05 at intersil.com (Martin, Jonathan (Contractor)) |
Date: |
Mon, 26 Feb 2007 14:32:00 -0500 |
Granted, you are correct and the opposite could also be true. My 5 year backup
could start on the last part of tape number one, fill tape number 2 and part of
number 3. That would be terribly inefficient given that yes, I'm now offsiting
three tapes instead of two. That has to be managed, and I do manage it. Disk
staging helps with this, job scheduling helps as well.
Really what we need to have is a high level analyzer of what data gets written
to what medium when. I don't see that happening anytime soon although some of
the 3rd party tools are getting there. Long story short, I was able with
proper planning to go from media efficiency somewhere in the 60% range to 90%
which is a huge savings in tape costs. Depending entirely on configuration,
Multiple Retentions per media could be a very good or a very bad thing and
recommendations for or against using it need to be qualified as such. IMO
multiple volume pools is a MUCH LESS efficient thing to do than Multiple
Retentions Per Media although as I mentioned 6.5 is going to help that greatly!
-Jonathan
-----Original Message-----
From: veritas-bu-bounces at mailman.eng.auburn.edu [mailto:veritas-bu-bounces
at mailman.eng.auburn.edu] On Behalf Of Paul Keating
Sent: Monday, February 26, 2007 1:42 PM
To: Veritas-bu at mailman.eng.auburn.edu
Subject: Re: [Veritas-bu] Multiple retention in one pool
You do realize that the opposite is true, in that by allowing mixed retentions
in this way, you are also allowing as little as a few block of 5 year retention
data to be written to the end of a 400Gig tape full of 2-3 week retention data.
So that Tape which could go back to scratch after 2 weeks is being locked up by
few blocks of data for 5 years.
Paul
--
> -----Original Message-----
> From: veritas-bu-bounces at mailman.eng.auburn.edu
> [mailto:veritas-bu-bounces at mailman.eng.auburn.edu] On Behalf Of
> Martin, Jonathan (Contractor)
> Sent: February 26, 2007 1:28 PM
> To: Justin Piszcz; chodhetz
> Cc: veritas-bu at mailman.eng.auburn.edu
> Subject: Re: [Veritas-bu] Multiple retention in one pool
>
>
> I have to keep
> email backups (two tapes or so) for 5 years. That's two tapes I'm
> losing for 5 years, why not take the 80% free space on tape #2 and put
> some 1 year retention data on it?
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