Date: Thu, 08 Sep 2005 09:14:21 -0700 From: garys@opusnet.com (Gary W. Swearingen) To: "vdemart1@tin.it" <vdemart1@tin.it> Cc: freebsd-questions@freebsd.org Subject: Re: tarring a dump. Problems with a pipe Message-ID: <njd5nj8rky.5nj@mail.opusnet.com> In-Reply-To: <200509081521.j88FL8N3085702@aristotle.tamu.edu> (Robin Smith's message of "Thu, 08 Sep 2005 10:21:03 -0500") References: <200509081521.j88FL8N3085702@aristotle.tamu.edu>
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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.
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