Date: Sun, 23 Jul 2006 09:15:38 +0100 From: Richard Collyer <richard@firebadger.net> To: freebsd-questions@freebsd.org Subject: Re: Slow Write Performance on 3ware controller Message-ID: <44C3302A.5070803@firebadger.net> In-Reply-To: <ef10de9a0607222328s59147419h356b05cdb6e68234@mail.gmail.com> References: <44C26B7A.30200@firebadger.net> <44C27E7B.3070103@firebadger.net> <ef10de9a0607222328s59147419h356b05cdb6e68234@mail.gmail.com>
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Nikolas Britton 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: I get: [root@brian:/home/richard] $ diskinfo -t /dev/da0 /dev/da0 512 # sectorsize 499977814016 # mediasize in bytes (466G) 976519168 # mediasize in sectors 60785 # Cylinders according to firmware. 255 # Heads according to firmware. 63 # Sectors according to firmware. Seek times: Full stroke: 250 iter in 2.572859 sec = 10.291 msec Half stroke: 250 iter in 2.957264 sec = 11.829 msec Quarter stroke: 500 iter in 6.256571 sec = 12.513 msec Short forward: 400 iter in 2.555676 sec = 6.389 msec Short backward: 400 iter in 2.474576 sec = 6.186 msec Seq outer: 2048 iter in 0.556584 sec = 0.272 msec Seq inner: 2048 iter in 0.593798 sec = 0.290 msec Transfer rates: outside: 102400 kbytes in 2.080951 sec = 49208 kbytes/sec middle: 102400 kbytes in 2.102060 sec = 48714 kbytes/sec inside: 102400 kbytes in 2.054728 sec = 49836 kbytes/sec Not too bad, not too great. Cheers Richard
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