Date: Thu, 28 Apr 2005 15:18:33 +0100 From: "Steven Hartland" <killing@multiplay.co.uk> To: <freebsd-hackers@freebsd.org>, <freebsd-current@freebsd.org> Subject: Very low disk performance Highpoint 1820a Message-ID: <069901c54bfd$2967ba40$7f06000a@int.mediasurface.com>
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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?
Steve
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