SATA Raid (stress test..)
Nikolas Britton
nikolas.britton at gmail.com
Thu Mar 2 06:41:40 PST 2006
On 3/2/06, Alex Zbyslaw <xfb52 at 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 = 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.
>
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 = 14.010 msec
Half stroke: 250 iter in 2.749807 sec = 10.999 msec
Quarter stroke: 500 iter in 4.919431 sec = 9.839 msec
Short forward: 400 iter in 2.257898 sec = 5.645 msec
Short backward: 400 iter in 2.293915 sec = 5.735 msec
Seq outer: 2048 iter in 0.132233 sec = 0.065 msec
Seq inner: 2048 iter in 0.152473 sec = 0.074 msec
Transfer rates:
outside: 102400 kbytes in 1.487112 sec = 68858 kbytes/sec
middle: 102400 kbytes in 1.505039 sec = 68038 kbytes/sec
inside: 102400 kbytes in 1.336495 sec = 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/
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