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List: bacula-users
Subject: Re: [Bacula-users] Multiplexing multiple jobs to tape
From: Mike Ruskai <thannyd () earthlink ! net>
Date: 2007-08-31 10:55:37
Message-ID: 6.2.5.6.2.20070831063724.01f8f618 () earthlink ! net
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[Attachment #2 (multipart/alternative)]
At 05:31 08/31/2007, Chris Howells wrote:
>Hi,
>
>I am trying to figure out whether bacula supports multiplexing multiple
>simultaneous backup jobs to the same tape - having googled, the results
>are inconclusive :)
>
>I am currently playing with an LTO-4 tape drive which has a raw data
>transfer rate of 120MB/sec. Clearly any single machine is going to have
>difficulty in maxing out the drive. I'd therefore like to try running
>backups from multiple machines to the drive simultaneously.
Since tape is a linear medium, and not random-access, the only
plausible way for what you suggest to work would be for Bacula to
interleave data blocks from two or more backup jobs. At a minimum,
this would require writing incredible amounts of data to the backend
database to keep track of which blocks on a given tape belong to
which portions of a given file from a given backup.
I very much doubt Bacula can do anything quite like that.
You should probably spend more time looking into your network instead.
[Attachment #5 (text/html)]
<html>
<body>
<font size=3>At 05:31 08/31/2007, Chris Howells wrote:<br>
<blockquote type=cite class=cite cite="">Hi,<br><br>
I am trying to figure out whether bacula supports multiplexing
multiple<br>
simultaneous backup jobs to the same tape - having googled, the
results<br>
are inconclusive :)<br><br>
I am currently playing with an LTO-4 tape drive which has a raw data<br>
transfer rate of 120MB/sec. Clearly any single machine is going to
have<br>
difficulty in maxing out the drive. I'd therefore like to try
running<br>
backups from multiple machines to the drive simultaneously.<br>
</font></blockquote><br>
Since tape is a linear medium, and not random-access, the only plausible
way for what you suggest to work would be for Bacula to interleave data
blocks from two or more backup jobs. At a minimum, this would
require writing incredible amounts of data to the backend database to
keep track of which blocks on a given tape belong to which portions of a
given file from a given backup.<br><br>
I very much doubt Bacula can do anything quite like that.<br><br>
You should probably spend more time looking into your network
instead.<br><br>
</body>
<br>
</html>
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