ADSM-L

Re: Tape Management

1998-09-07 11:29:35
Subject: Re: Tape Management
From: Rui Malheiro <rmalheiro AT MAIL.TELEPAC DOT PT>
Date: Mon, 7 Sep 1998 15:29:35 GMT
Replying to: David Beardsley <DavidBeardsley AT WINN-DIXIE DOT COM> (Fri, 4 Sep
1998 15:14:06 -0400)

>I am rolling out about 1200 ADSM servers to our stores. We are using 3575
>C-11 Libraries.
>We are only putting one physical drive in the library, and we are backing up
>2 servers. One NT and another one AIX.
>I am running ADSM on the NT server. And we do not have much free hard drive
>space on the server, what are your recommendations as far tape reclamation
>and management options.

With only one drive and "not much" disk space tape reclamaton may be a
problem. Exactly how much is "not much"? 

If you can manage at least 100Mb for a reclamation staging pool, then start
with a high reclamation threshold, say 90%. This way, a 3570 tape (3:1
compression) will reclaim when it still has about 1.5GB, requiring at least
15 tape mounts per tape reclaimed.

Or, you can set reclaim threshold to 100% (no reclamation) and wait for the
tapes to go empty.

One alternative is to use a slower (and cheaper) manual tape drive (4mm,
8mm) as a reclamation staging pool.

BTW: one drive and no disk space also means no copy pools, so you don't have
one of ADSM's best features: backup the backup.

--
Rui Malheiro,
Rui Malheiro,
6 Mil - Tecnologias de Informacao
URL: <http://www.6mil.pt/>
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