Hello
I agree Arno. But then the problem comes to decide onto the rentention period
of the pools. Like then it becomes difficult to preplan the retention periods
of the volumes. And this is what happened recently , our backup strategy which
worked for last year with 4 months of pool rentention period, suddenly did not
find any volumes to append as all the volumes were last written within 4 months
of range. Hope I am clear.
Thanks,
-----Original Message-----
From: Arno Lehmann [mailto:al AT its-lehmann DOT de]
Sent: Freitag, 12. Juni 2009 09:32
To: bacula-users
Subject: Re: [Bacula-users] Bacula
Hi,
12.06.2009 08:31, Holikar, Sachin (ext) wrote:
>
> Hello,
>
> In Bacula, we are using LTO-3 Tapes defined in a volume. One strange
> this we notice is , the tapes are marked as full for different Volume
> Bytes written.
> Please see below, for one tape, it shows as around 800 GB of Bytes
> written and marked as Full (eg AAD413). At the same time other tape is
> written only 400 GB and showing as Full (E.g AAD483).
> Is there anything we are missing out to understand or it is something else.
> Kindly suggest.
There are two reasons for that behaviour.
One, Bacula considers any write problem as a tape full condition.
That's because, for a an application, it would be very hard to
determine if the tape is actually full or not. And, as long as the
data written to tape can be read (Bacula verifies that at least the
last block it wrote to any volume can be read), it doesn't matter much
anyway...
Two, transparent hardware data compression makes it impossible to know
how much data will actually fit onto a given tape. If you've got lots
of text data (common for incremental backups of, for example, web
servers) that will compress very well. If you're backing up your movie
collection, that will compress very little, if at all. The compression
ratios the manufacturers give are estimates, and ones biased towards
better compression for marketing reasons even.
So, in short, if you can verify that your tapes are written without
problems (easily checked in the system's log file), you can simply
accept the volume sizes given.
Arno
>
> Here is the current status of the list volumes,
>
> week
> Volume Name Volume Bytes Media Type When expire? Last Written Volume
> Status
> AAD413 832.36 GB LTO-3 2009/10/02 2009/06/04 Full
> AAD463 837.05 GB LTO-3 2009/08/31 2009/05/03 Full
> AAD465 1.17 TB LTO-3 2009/09/14 2009/05/17 Full
> AAD473 125.13 GB LTO-3 2009/10/09 2009/06/11 Append
> AAD477 501.69 GB LTO-3 2009/08/02 2009/04/04 Full
> AAD479 503.99 GB LTO-3 2009/06/07 2009/02/07 Full
> AAD483 460.94 GB LTO-3 2009/09/26 2009/05/29 Full
>
> Thanks,
>
>
> ------------------------------------------------------------------------
>
> ------------------------------------------------------------------------------
> Crystal Reports - New Free Runtime and 30 Day Trial
> Check out the new simplified licensing option that enables unlimited
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>
>
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>
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--
Arno Lehmann
IT-Service Lehmann
Sandstr. 6, 49080 Osnabrück
www.its-lehmann.de
------------------------------------------------------------------------------
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Check out the new simplified licensing option that enables unlimited
royalty-free distribution of the report engine for externally facing
server and web deployment.
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_______________________________________________
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------------------------------------------------------------------------------
Crystal Reports - New Free Runtime and 30 Day Trial
Check out the new simplified licensing option that enables unlimited
royalty-free distribution of the report engine for externally facing
server and web deployment.
http://p.sf.net/sfu/businessobjects
_______________________________________________
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Bacula-users AT lists.sourceforge DOT net
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