Date: Thu, 16 Aug 2007 16:20:33 +0200 From: "Federico Lorenzi" <florenzi@gmail.com> To: "John Nielsen" <lists@jnielsen.net> Cc: Grant Peel <gpeel@thenetnow.com>, freebsd-questions@freebsd.org Subject: Re: Dump + GZIP Message-ID: <3a386af20708160720x293bef5cya2cd41cebdf79c63@mail.gmail.com> In-Reply-To: <200708160910.14095.lists@jnielsen.net> References: <00b601c7e003$fb1e0200$6501a8c0@GRANT> <200708160910.14095.lists@jnielsen.net>
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On 8/16/07, John Nielsen <lists@jnielsen.net> wrote: > On Thursday 16 August 2007, Grant Peel wrote: > > Can I safely pump a filesystem dump through gzip during the dumping > > process?, or di I need to create the dump first then gzip it after? > > I do it all the time: dump -f - ... | gzip > date_filesystem.dump.gz > or with bzip2: dump -f - ... | bzip2 > date_filesystem.dump.bz2 > > > Does zipping the dumps cause any headaches at restore time? > > Nope: bzcat date_filesystem.dump.bz2 | restore ... -f - > > > (I currently dump 5 servers worth of data to a raid 5 array, and am about > > 20% away from running out of disk space). > > > > Does gzipping a file give a decent compression ratio? > > Depends on what you're compressing, but generally yes. bzip2 generally > compresses better but takes a lot more time, CPU and memory at compression > time. Try give LZMA a shot. The last time I checked, it was a lot faster then bzip2 at decompression and made smaller files too. For speed however, gzip would be the best choice. Federico
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