Date: Sun, 23 Jul 2006 01:34:49 -0500 From: "Nikolas Britton" <nikolas.britton@gmail.com> To: "Richard Collyer" <richard@firebadger.net> Cc: freebsd-questions@freebsd.org Subject: Re: Slow Write Performance on 3ware controller Message-ID: <ef10de9a0607222334xa96e272m61b069f436c6997f@mail.gmail.com> In-Reply-To: <ef10de9a0607222328s59147419h356b05cdb6e68234@mail.gmail.com> References: <44C26B7A.30200@firebadger.net> <44C27E7B.3070103@firebadger.net> <ef10de9a0607222328s59147419h356b05cdb6e68234@mail.gmail.com>
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On 7/23/06, Nikolas Britton <nikolas.britton@gmail.com> wrote: > On 7/22/06, Richard Collyer <richard@firebadger.net> wrote: > > Completely ignore me. Write caching wasnt turned on. > > > > Even with write caching off you should be able to hit 50MB/s... did I > missing something? Try running 'diskinfo -t /dev/diskname'. For > refrence here are the numbers from my single 400GB Seagate ST3400832AS > drive, if you can't bet it then something is wrong with your setup: > > > diskinfo -t /dev/ad4 > /dev/ad4 > 512 # sectorsize > 400088457216 # mediasize in bytes (373G) > 781422768 # mediasize in sectors > 775221 # Cylinders according to firmware. > 16 # Heads according to firmware. > 63 # Sectors according to firmware. > > Seek times: > Full stroke: 250 iter in 5.844998 sec = 23.380 msec > Half stroke: 250 iter in 4.558075 sec = 18.232 msec > Quarter stroke: 500 iter in 7.147166 sec = 14.294 msec > Short forward: 400 iter in 2.253667 sec = 5.634 msec > Short backward: 400 iter in 2.013481 sec = 5.034 msec > Seq outer: 2048 iter in 0.332809 sec = 0.163 msec > Seq inner: 2048 iter in 0.349674 sec = 0.171 msec > Transfer rates: > outside: 102400 kbytes in 1.503943 sec = 68088 kbytes/sec > middle: 102400 kbytes in 1.688924 sec = 60630 kbytes/sec > inside: 102400 kbytes in 3.021035 sec = 33896 kbytes/sec > To test write speed use dd: 'dd if=/dev/zero of=testfile bs=4m' ^C128+0 records in 127+0 records out 532676608 bytes transferred in 10.840476 secs (49137752 bytes/sec) 46.87MB/s. -- BSD Podcasts @: http://bsdtalk.blogspot.com/ http://freebsdforall.blogspot.com/
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