Date: Thu, 2 Mar 2006 08:41:33 -0600 From: "Nikolas Britton" <nikolas.britton@gmail.com> To: "Alex Zbyslaw" <xfb52@dial.pipex.com> Cc: Beastie <beastie@mra.co.id>, Liste FreeBSD <freebsd-questions@freebsd.org> Subject: Re: SATA Raid (stress test..) Message-ID: <ef10de9a0603020641t7014bf4cn9c9cc08b8d62af29@mail.gmail.com> In-Reply-To: <4406CB4D.5050300@dial.pipex.com> References: <61560.207.70.139.52.1139628926.squirrel@www.compedgeracing.com> <65260.207.70.139.52.1139998857.squirrel@www.compedgeracing.com> <06b901c63220$3a849eb0$c801a8c0@nexpc> <50778.207.70.139.52.1140002253.squirrel@www.compedgeracing.com> <43F3EDD6.80707@mra.co.id> <44052663.7000802@mra.co.id> <440565FF.3030002@mra.co.id> <44058D9E.3010801@dial.pipex.com> <440675E0.1020204@mra.co.id> <4406CB4D.5050300@dial.pipex.com>
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On 3/2/06, Alex Zbyslaw <xfb52@dial.pipex.com> wrote:
>
[snipped]
>
> Why not happy? Transfer rates from 53 to 92Mb/s, give or take; what's
> wrong with that? On a plain sata disk I get:
>
> Seek times:
> Full stroke: 250 iter in 4.717248 sec =3D 18.869 msec
> Half stroke: 250 iter in 5.342099 sec =3D 21.368 msec
> Quarter stroke: 500 iter in 8.870424 sec =3D 17.741 msec
> Short forward: 400 iter in 2.753187 sec =3D 6.883 msec
> Short backward: 400 iter in 1.390941 sec =3D 3.477 msec
> Seq outer: 2048 iter in 0.426796 sec =3D 0.208 msec
> Seq inner: 2048 iter in 0.487280 sec =3D 0.238 msec
> Transfer rates:
> outside: 102400 kbytes in 1.652736 sec =3D 61958 kbyte=
s/sec
> middle: 102400 kbytes in 1.697364 sec =3D 60329 kbyte=
s/sec
> inside: 102400 kbytes in 1.834759 sec =3D 55811 kbyte=
s/sec
>
> A second, different, disk gives me better seek times but roughly similar
> transfer rates. So I beat your inside transfer rate, but you're 50% up
> on the outside rate.
>
> If you have windows anywhere, then download sandra-lite. Among other
> things, it has comparison benchmarks for all its tests, including disk
> transfer rates for things like SCSI-RAID0, RAID1, SATA/PATA-RAID0/1 etc.
>
diskinfo -t /dev/da0e
/dev/da0
512 # sectorsize
1756440297472 # mediasize in bytes (1.6T)
3430547456 # mediasize in sectors
213541 # Cylinders according to firmware.
255 # Heads according to firmware.
63 # Sectors according to firmware.
Seek times:
Full stroke: 250 iter in 3.502539 sec =3D 14.010 msec
Half stroke: 250 iter in 2.749807 sec =3D 10.999 msec
Quarter stroke: 500 iter in 4.919431 sec =3D 9.839 msec
Short forward: 400 iter in 2.257898 sec =3D 5.645 msec
Short backward: 400 iter in 2.293915 sec =3D 5.735 msec
Seq outer: 2048 iter in 0.132233 sec =3D 0.065 msec
Seq inner: 2048 iter in 0.152473 sec =3D 0.074 msec
Transfer rates:
outside: 102400 kbytes in 1.487112 sec =3D 68858 kbytes/=
sec
middle: 102400 kbytes in 1.505039 sec =3D 68038 kbytes/=
sec
inside: 102400 kbytes in 1.336495 sec =3D 76618 kbytes/=
sec
This and all the other benchmarks you've run are useless. Run a real
benchmark like iozone. It's in ports under benchmarks/iozone.
http://www.iozone.org/
--
BSD Podcasts @ http://bsdtalk.blogspot.com/
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