ADSM-L

Re: Compression

2000-02-01 13:27:44
Subject: Re: Compression
From: "Wayne T. Smith" <ADSM AT MAINE DOT EDU>
Date: Tue, 1 Feb 2000 13:27:44 -0500
Chris has produced great discussion with ...
> Is there any advantages or disadvantages to using "Compression"
> with how it relates to Nodes in *sm?

Back with Version 2 clients, we had some backup duration problems
that were easily traced to "COMPRESSALWAYS NO".  ADSM would
compress a file only to find it expand a bit, reject the compressed
version and (apparently) waste a lot of time, perhaps with
retransmission of data (speculation).

Given the size ratio of our disk to tape pools, I suspect that I use *SM
client compression too much, especially since there often appears to
be a restore penalty for compressed files.

In theory or in practice, does *SM overlap compression and
transmission during backup and/or restore?

cheers, wayne


Wayne T. Smith                          ADSM AT Maine DOT edu
ADSM Technical Coordinator - UNET       University of Maine System
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