[Bacula-users] Fwd: (Solved!) Writing too much data to tape?

---------- Forwarded message ----------
From: John Drescher <drescherjm AT gmail DOT com>
Date: Fri, Dec 4, 2009 at 2:48 PM
Subject: Re: [Bacula-users] (Solved!) Writing too much data to tape?
To: Jason Selwitz <jselwitz AT vvisions DOT com>


On Fri, Dec 4, 2009 at 2:38 PM, Jason Selwitz <jselwitz AT vvisions DOT com> 
wrote:
> On Tue, 2009-11-24 at 08:50 -0500, John Drescher wrote:
>> >> Do you have any GB+ files full of only zeroes?
>> >>
>> >> John
>> >
>> > Not that I am aware of, the majority of the data backed up is user
>> > submitted production data so unless someone dropped some files like
>> that
>> > in there for some test purpose, I don't know of any, I recently
>> > compacted the MySQL database however this issue had occurred prior
>> to
>> > that. the only significant event that comes to mind is that the
>> server
>> > was moved up a few U's in the rack a few weeks back.
>> >
>>
>> You can check backup sizes using status client or the bacula logs. If
>> you see a job with way more data than expected this could be the
>> problem.
>>
>> John
>
> So it looks like I solved the issue I had where it looked like Bacula
> was writing 10+ TB per tape. this issue seemed to only occur when I was
> backing up extremely large file systems (2 TB, 10 TB, etc) and only when
> attempting to back up the .snap directory on a FreeBSD file system,
> apparently it was trying to back up all of the historical filesystem
> snapshot data as though it was full size, this reporting a lot of extra
> space on the tape, so excluding the .snap Directory fixed the problem.
> Hope that is useful to others as well.
>
>

Probably very large sparse files that will compress very very well.

--
John M. Drescher



-- 
John M. Drescher

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