Date: Sun, 23 Jul 2006 04:15:39 -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: <ef10de9a0607230215x4025d344vd5e62107bd9b8b8a@mail.gmail.com> In-Reply-To: <44C3302A.5070803@firebadger.net> References: <44C26B7A.30200@firebadger.net> <44C27E7B.3070103@firebadger.net> <ef10de9a0607222328s59147419h356b05cdb6e68234@mail.gmail.com> <44C3302A.5070803@firebadger.net>
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On 7/23/06, Richard Collyer <richard@firebadger.net> wrote: > 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. > That would be unacceptable in my book. Whats the load on the system? Is the 3ware 9500S in a regular PCI 33MHz/32-bit slot? Motherboard/CPU? -- BSD Podcasts @: http://bsdtalk.blogspot.com/ http://freebsdforall.blogspot.com/
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