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To: "vdemart1@tin.it" <vdemart1@tin.it>
References: <200509081521.j88FL8N3085702@aristotle.tamu.edu>
From: garys@opusnet.com (Gary W. Swearingen)
Date: Thu, 08 Sep 2005 09:14:21 -0700
In-Reply-To: <200509081521.j88FL8N3085702@aristotle.tamu.edu> (Robin Smith's
	message of "Thu, 08 Sep 2005 10:21:03 -0500")
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Cc: freebsd-questions@freebsd.org
Subject: Re: tarring a dump. Problems with a pipe
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Robin Smith <rasmith@aristotle.tamu.edu> writes:

> dump -0 -f - /dev/yourfilesystem |bzip2 -c >dump.bz

I compressed a filesystem dump (on Athlon 64/3200+, i386 OS) and

    bzip2  compressed to 50% of 2 GB in 1118 sec 
    gzip   compressed to 52% of 2 GB in  306 sec

But bzip2 can compress much better than that on some stuff.

If your goal is a small backup, bzip compresses better.
If your goal is a quick backup to disk, gzip is faster.
If your goal is a quick backup to tape, bzip is faster
   because tape is so slow, unless your CPU can't keep up.