Date: Thu, 28 Apr 2005 15:35:39 +0100 From: "Steven Hartland" <killing@multiplay.co.uk> To: <freebsd-hackers@freebsd.org>, <freebsd-performance@freebsd.org> Subject: Re: Very low disk performance Highpoint 1820a Message-ID: <06ba01c54bff$8c5aed00$7f06000a@int.mediasurface.com>
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Sorry wanted to send to performance not current :)
Steve
----- Original Message -----
> I've just finished putting together a new server box spec:
> Dual AMD 244, 2GB ram, 5 * Seagate SATA 400GB on a
> Highpoint 1820a RAID 5 array.
> The machine is currently running 5.4-STABLE ( from the
> weekend ) After install I did some basic tests and the
> disk is return very poor performance low in fact than a
> single disk on a bog standard ATA 100 controller:
>
> 5.4-STABLE Highpoint 1820a RAID 5 ( 5 disk )
> dd if=/dev/da0 of=/dev/null bs=64k count=10000
> 10000+0 records in
> 10000+0 records out
> 655360000 bytes transferred in 13.348032 secs (49097875 bytes/sec)
>
> 5.3-RELEASE Highpoint 454 RAID 5 ( 4 disk )
> dd if=/dev/da0 of=/dev/null bs=64k count=10000
> 10000+0 records in
> 10000+0 records out
> 655360000 bytes transferred in 20.410034 secs (32109697 bytes/sec)
>
> 5.2.1-RELEASE Intel ICH3 UDMA100 ( 1 disk )
> dd if=/dev/ad0 of=/dev/null bs=64k count=10000
> 10000+0 records in
> 10000+0 records out
> 655360000 bytes transferred in 11.142405 secs (58816745 bytes/sec)
>
> Obviously something is seriously a miss here somewhere as
> both the RAID 5 arrays a producing less throughput than
> a single disk.
>
> Where do I start looking?
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