Date: Wed, 16 Apr 2008 17:35:55 -0400 From: "Benjeman J. Meekhof" <bmeekhof@umich.edu> To: freebsd-performance@freebsd.org Subject: Re: ZFS, Dell PE2950 Message-ID: <4806713B.2060405@umich.edu> In-Reply-To: <fu5o3e$3ib$2@ger.gmane.org> References: <480548CF.5080104@umich.edu> <fu4f1u$81f$1@ger.gmane.org> <4806221C.20202@umich.edu> <fu5n3b$vm6$1@ger.gmane.org> <fu5o3e$3ib$2@ger.gmane.org>
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I have some old dd numbers from when I was experimenting to find a UFS/gstripe combination that wasn't horrifyingly slow to read. I was not then adjusting filesystem blocksize, and not until moving UFS2 bs to the maximum did initial results seem worth resuming iozone tests. Raid HW stripe-width is 128k. FWIW. # using 4k stripe, same as above #gstripe label -v -s 4k test /dev/mfid0 /dev/mfid2 #newfs -U /dev/stripe/test #time dd if=/dev/zero of=/test/deletafile bs=1M count=10240 #time dd if=/test/deletafile of=/dev/null bs=1M count=10240 #write: 26.5s 403665800 bps #read: 157s 68343843 bps -Ben Ivan Voras wrote: > Ivan Voras wrote: > >> Per my discussion with Scott Long Can you repeat the test for UFS, but >> create gstripe with a really small stripe size, like 4 KB? > > Actually, no need to do that - it looks like iozone is doing quite > random IO ops so it won't help you. >
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