Date: Wed, 12 Oct 2011 09:37:10 -0700 From: David Brodbeck <brodbd@uw.edu> To: freebsd-fs@freebsd.org Subject: Re: ZFS/compression/performance Message-ID: <CAHHaOua7zwp4DCgcU4bSFG2d-Kz-j_ovV7YiSMqmy700wFjBHg@mail.gmail.com> In-Reply-To: <j73vl7$v02$1@dough.gmane.org> References: <alpine.BSF.2.00.1110111710210.12895@Elmer.dco.penx.com> <j73vl7$v02$1@dough.gmane.org>
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On Wed, Oct 12, 2011 at 5:02 AM, Johannes Totz <jtotz@imperial.ac.uk> wrote: > I just did a simple write test yesterday: > > 1) 6 MB/sec for gzip, 1.36x ratio > 2) 34 MB/sec for lzjb, 1.23x ratio > > I'll stick with lzjb. It's good enough to get rid of most of the > redundancy and speed is acceptable. > That's what we use on our text-heavy filesystems on our OpenSolaris server. (We work with large text corpora, so we have hundreds of gigabytes of pure text.) My benchmarks showed the performance hit for reads is nonexistent when viewed over NFS, and the performance hit for writes is relatively small...plus we don't write to that filesystem much. We see about 1.5x compression overall, with a little over 2x on some datasets that are particularly compressible. -- David Brodbeck System Administrator, Linguistics University of Washington
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