ADSM-L

Re: Turning collocation off?

2003-04-07 10:55:07
Subject: Re: Turning collocation off?
From: Paul Zarnowski <vkm AT CORNELLC.CIT.CORNELL DOT EDU>
To: ADSM-L AT VM.MARIST DOT EDU
Date: Mon, 7 Apr 2003 10:54:29 -0400
If you want to increase the utilization of your tape pool, you can allocate
fewer tapes to it.  The number you allocate will depend on what tradeoff
you want to make between tape utilization and collocation effectiveness.

The big drawback to turning collocation off is that it will slow down
restores due to increased tape mount activity during the restore
process.  Over time, it will get worse and worse.

At 03:17 PM 4/7/2003 +0100, Farren Minns wrote:
Hi All

Running TSM 4.2.2.12 on Sol 2.7 server. At present we use collocation on
the tapes within the TAPEPOOL (i.e. in the 3494 library). We are getting to
a point where the number of available scratch tapes in the lib is getting
small and I'm considering turning collocation off. We always seem to have
about 25-30 tapes that are under 10% used which seems like a large waste of
space.

I understand that collocation speeds things up in the event of a system
restore, but this is something that we rarely (in fact, never in the last
two years) need to do and anyway, the library can handle all the tape
mounts and stuff.

This is all rather long winded, but my question is simple. Are there any
things I should be aware of before setting collocation to NO. i.e., are
there any possible problems I may encounter.

Many thanks

Farren Minns - John Wiley & Sons Ltd
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--
Paul Zarnowski                         Ph: 607-255-4757
719 Rhodes Hall, Cornell University    Fx: 607-255-8521
Ithaca, NY 14853-3801                  Em: psz1 AT cornell DOT edu

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