Bacula-users

Re: [Bacula-users] LTO-3 tape Not Compressing data and speed

2011-01-14 16:02:40
Subject: Re: [Bacula-users] LTO-3 tape Not Compressing data and speed
From: John Drescher <drescherjm AT gmail DOT com>
To: Jose Antonio Rodriguez Martin <jarodriguez AT cgi DOT es>, bacula-users <Bacula-users AT lists.sourceforge DOT net>, dibun AT hotmail DOT com
Date: Fri, 14 Jan 2011 15:59:59 -0500
> # tapeinfo-f / dev/sg5
> ...
> DataCompEnabled: yes
> ...

This means compression is on and is being used.

Although remember if you had compression off and then wrote anything
to a tape then tried to turn compression on that tape will not be
compressed because you can not toggle compression on or off after data
is written to a tape. You can recover with a rewind then weof. Then
the tape can be switched to use compression. mt -f status with the
tape loaded should tell you if compression is enabled on the tape.

John

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