Slow Write Performance on 3ware controller

[Nikolas Britton]

On 7/23/06, Richard Collyer <richard at firebadger.net> wrote:
> Nikolas Britton wrote:
> > On 7/22/06, Richard Collyer <richard at 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 at 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?


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