Bacula-users

Re: [Bacula-users] Unusually high compression ratio/capacity for LTO-4 tapes?

2012-02-08 16:10:57
Subject: Re: [Bacula-users] Unusually high compression ratio/capacity for LTO-4 tapes?
From: John Drescher <drescherjm AT gmail DOT com>
To: Josh Nielsen <jnielsen AT hudsonalpha DOT com>
Date: Wed, 8 Feb 2012 16:09:18 -0500
> Has anyone heard of getting more capacity out of an LTO-4 tape than it is
> rated for? Or are the byte amounts inflated, possibly, by artificially
> counting skipped-over file systems? I got several messages like "/boot is a
> different filesystem. Will not descend from / into /boot", but you would
> think that it wouldn't count those in the overall storage amount. I
> essentially just want to know if these figures are real, and if I'm just
> getting an awesome compression ratio, or if something else is going on.
>

Yes. I have fit over 1.8 TB on an LTO2 tape.. This happens if my
backups set includes mostly highly compressible data and / or sparse
files. My average over all backups (120+ LTO2 tapes) however is about
1:5 to 1.

John

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