Intel Core 2 DUO

Polytropon freebsd at
Wed Oct 30 03:08:59 UTC 2013

On Wed, 30 Oct 2013 10:00:27 +0700, Olivier Nicole wrote:
> Compressing a 500GB dump takes a lot of
> calculation.

I'm not sure in how far the following theoretic speculation
applies to real-world usage, but I'd like to mention it anyways.
If you add compression to an archive, this compression might
remove redundancy of data. For example, a minimal corruption
of a compressed file could have a massive impact on the data,
even up to losing the ability to uncompress it, whereas an
uncompressed archive could use the built-in redundancy to
handle the problem and still deliver the content properly.

The _kind of data_ stored may also be considered regarding
the question of compression adding any advantage (requiring
less storage space). Depending on what you backup, simply
omitting compression could reduce the processing load for
that backup, resulting in less requirements regarding CPU
and RAM (at the cost of maybe more storage space).

Magdeburg, Germany
Happy FreeBSD user since 4.0
Andra moi ennepe, Mousa, ...

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