good performing SCSI RAID5 ( was: asr ( 2015S ) support in 5.4 amd64? )

[Steven Hartland]

Thanks for that Bruce I'm quite surprised that these numbers are
so low after playing with a cheapo hightech SATA controller which
with the help of the guys on the list I was able to give out 200MB/s
I really would expect the relatively expensive SCSI controllers to
do significantly better especially as they have superior disks attached
( 10K vs 7k2 ) and not performance which is well below ( 1/2 )
that expected of a single disk.

Can anyone report good performance from their SCSI RAID5
set on 5.4?

    Steve
----- Original Message ----- 
From: "Bruce Burden" <brucegb at realtime.net>
>   My 3210S generates around 45Mps:
> 
> su-2.05b# dd if=ft_sill_photos.zip of=/dev/null
> 4040211+1 records in
> 4040211+1 records out
> 2068588162 bytes transferred in 46.935343 secs (44073145 bytes/sec)
> su-2.05b# dd if=ft_sill_photos.zip of=/dev/null bs=65536
> 31564+1 records in
> 31564+1 records out
> 2068588162 bytes transferred in 45.793030 secs (45172555 bytes/sec)
> 
>   Compared to my 39320:
> 
> su-2.05b# cd /spare
> su-2.05b# dd if=ft_sill_photos.zip of=/dev/null bs=65536
> 31564+1 records in
> 31564+1 records out
> 2068588162 bytes transferred in 84.538472 secs (24469193 bytes/sec)
> 
>   which is where the system files are mounted (/, /var, /usr, etc).
> 
> Both cards are installed in 64 bit/66 MHz slots. The system
>   disk is a 10K IBM U160 disk, the RAID is composed of Seagate U320
>   drives. Still, performance is limited to U160 levels due to the
>   controllers or the drives...


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