Slow Write Performance on 3ware controller

[Nikolas Britton]

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:

> 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


>
> Richard Collyer wrote:
> > Hello,
> >
> > I recently installed a 3ware 9500S-12 along with 3 x 250GB Seagate
> > 7200.10 Drives.
> >
> > I am getting very poor read/write performance on this array that I have
> > set up (RAID5 - 64K stripe)
> >
> > Reading to the 2 mirrored drives that I have on a 3ware 7006-2 I can get
> >  8MB/sec over samba which is what I expect. From the new array I am
> > getting 4MB/sec. To rule out samba I did a file copy from one array to
> > the other an averaged 3.8MB/sec which I assume is being limited by the
> > new array.
> >
> > Any ideas where I can check to see if there are problems and what are
> > the first steps / common things that people miss when adding drives.
> >
> > In short I...
> >
> > a) installed the drive
> > b) disk partitioned using /stand/sysinstall
> > c) labelled using the same
> > d) edited /etc/drivetabthingy to mount the drive
> >
> > Anyone else have any other suggestions on what I can check?
> >
> > Cheers
> > Richard
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