Date: Wed, 14 Jan 2004 10:11:08 -0500 From: lists@mediumgreen.com To: freebsd-stable@freebsd.org Subject: Re: Adaptect raid performance with FreeBSD Message-ID: <20040114151111.B4B3843D5D@mx1.FreeBSD.org> In-Reply-To: Message from Raymond Wiker <Raymond.Wiker@fast.no> <16389.15817.322098.577889@raw.grenland.fast.no>
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I think I heard Raymond Wiker say: >Ari Suutari writes: > > dd if=/dev/rda1s1a of=/dev/null bs=1m count=100 > > 100+0 records in > > 100+0 records out > > 104857600 bytes transferred in 4.193832 secs (25002814 bytes/sec) > > > > So, I get only about 25MB/s. Shouldn't I be getting something > > like 70 MB/s, or even more since there are two disks that > > can server read requests ? FWIW, on my mylex controller w/ raid 5 I'm getting: # dd if=/dev/da0s1g of=/dev/null bs=1m count=100 100+0 records in 100+0 records out 104857600 bytes transferred in 3.707196 secs (28284882 bytes/sec) and my dell perc3/dc (raid 5) is getting: # dd if=/dev/amrd0s2e of=/dev/null bs=1m count=100 100+0 records in 100+0 records out 104857600 bytes transferred in 2.133522 secs (49147653 bytes/sec) -matthew
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