Date: Thu, 02 Mar 2006 10:39:09 +0000 From: Alex Zbyslaw <xfb52@dial.pipex.com> To: Beastie <beastie@mra.co.id> Cc: Liste FreeBSD <freebsd-questions@freebsd.org> Subject: Re: SATA Raid (stress test..) Message-ID: <4406CB4D.5050300@dial.pipex.com> In-Reply-To: <440675E0.1020204@mra.co.id> References: <61560.207.70.139.52.1139628926.squirrel@www.compedgeracing.com> <6C543300-579C-4313-A355-0F26181B3FA7@todoo.biz> <067101c63216$a7682f10$c801a8c0@nexpc> <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>
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Beastie wrote:
>
> second tools is diskinfo, but i'm not quite happy with the result.
>
> #diskinfo -t /dev/amrd0s1d
> /dev/amrd0s1d
> 512 # sectorsize
> 999996609024 # mediasize in bytes (931G)
> 1953118377 # mediasize in sectors
> 121575 # Cylinders according to firmware.
> 255 # Heads according to firmware.
> 63 # Sectors according to firmware.
>
> Seek times:
> Full stroke: 250 iter in 5.233346 sec = 20.933 msec
> Half stroke: 250 iter in 3.828152 sec = 15.313 msec
> Quarter stroke: 500 iter in 6.232849 sec = 12.466 msec
> Short forward: 400 iter in 2.409001 sec = 6.023 msec
> Short backward: 400 iter in 2.594473 sec = 6.486 msec
> Seq outer: 2048 iter in 0.638372 sec = 0.312 msec
> Seq inner: 2048 iter in 0.671994 sec = 0.328 msec
> Transfer rates:
> outside: 102400 kbytes in 1.102065 sec = 92916
> kbytes/sec
> middle: 102400 kbytes in 1.209657 sec = 84652
> kbytes/sec
> inside: 102400 kbytes in 1.912485 sec = 53543
> kbytes/sec
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 = 18.869 msec
Half stroke: 250 iter in 5.342099 sec = 21.368 msec
Quarter stroke: 500 iter in 8.870424 sec = 17.741 msec
Short forward: 400 iter in 2.753187 sec = 6.883 msec
Short backward: 400 iter in 1.390941 sec = 3.477 msec
Seq outer: 2048 iter in 0.426796 sec = 0.208 msec
Seq inner: 2048 iter in 0.487280 sec = 0.238 msec
Transfer rates:
outside: 102400 kbytes in 1.652736 sec = 61958 kbytes/sec
middle: 102400 kbytes in 1.697364 sec = 60329 kbytes/sec
inside: 102400 kbytes in 1.834759 sec = 55811 kbytes/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.
--Alex
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