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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