Date: Sun, 23 Jul 2006 01:28:20 -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: <ef10de9a0607222328s59147419h356b05cdb6e68234@mail.gmail.com> In-Reply-To: <44C27E7B.3070103@firebadger.net> References: <44C26B7A.30200@firebadger.net> <44C27E7B.3070103@firebadger.net>
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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:
> 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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> >
> >
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>
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