Date: Wed, 20 Apr 2005 06:53:56 -0500 From: Eric Anderson <anderson@centtech.com> To: Claus Guttesen <kometen@gmail.com> Cc: freebsd-performance@freebsd.org Subject: Re: some simple nfs-benchmarks on 5.4 RC2 Message-ID: <426642D4.8000202@centtech.com> In-Reply-To: <b41c7552050420014730ae39e1@mail.gmail.com> References: <b41c75520504190418308f94cc@mail.gmail.com> <b41c75520504190443187617de@mail.gmail.com> <4264EF40.3060900@centtech.com> <b41c75520504190455542071f7@mail.gmail.com> <4264F8A8.3080405@centtech.com> <b41c755205041906145fc4719c@mail.gmail.com> <426507DC.50409@centtech.com> <b41c7552050419065519057cb2@mail.gmail.com> <42650EB2.4040409@centtech.com> <b41c75520504200117608f8e31@mail.gmail.com> <b41c7552050420014730ae39e1@mail.gmail.com>
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Claus Guttesen wrote: >>elin% dd if=/dev/zero of=/nfssrv/dd.tst bs=1024 count=1048576 >>1048576+0 records in >>1048576+0 records out >>1073741824 bytes transferred in 21.373114 secs (50237968 bytes/sec) >> > > > Follow-up, did the same dd on a Dell 2850 with a LSI Logic (amr), 6 > scsi-disks in a raid 5: > > frodo~%>dd if=/dev/zero of=dd.tst bs=1024 count=1048576 > 1048576+0 records in > 1048576+0 records out > 1073741824 bytes transferred in 8.972321 secs (119672693 bytes/sec) > > Must faster. FreeBSD 5.4 RC2. > > Are there any benchmarks comparing the atabeast against other > ide->fc-storage-systems in relation to disk-access? That's about what I expected. RAID 5 depends on fast xor, so a slow processor in a hardware RAID5 box will slow you down a lot. You should try taking the two RAID5's (6 disks each) created on your original controller and striping those together (RAID 50) - this should get you some better performance, probably not as close as the amr device, but I would guess somewhere in the 80-90mb/s range. Eric -- ------------------------------------------------------------------------ Eric Anderson Sr. Systems Administrator Centaur Technology A lost ounce of gold may be found, a lost moment of time never. ------------------------------------------------------------------------
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