Roger Lucas wrote:
-----Original Message-----
From: linux-raid-owner@xxxxxxxxxxxxxxx [mailto:linux-raid-
owner@xxxxxxxxxxxxxxx] On Behalf Of Bill Davidsen
Sent: 30 November 2006 14:13
To: linux-raid@xxxxxxxxxxxxxxx
Subject: Odd (slow) RAID performance
Pardon if you see this twice, I sent it last night and it never showed
up...
I was seeing some bad disk performance on a new install of Fedora Core
6, so I did some measurements of write speed, and it would appear that
write performance is so slow it can't write my data as fast as it is
generated :-(
What drive configuration are you using (SCSI / ATA / SATA), what chipset is
providing the disk interface and what cpu are you running with?
3xSATA, Seagate 320 ST3320620AS, Intel 6600, ICH7 controller using the
ata-piix driver, with drive cache set to write-back. It's not obvious to
me why that matters, but if it helps you see the problem I''m glad to
provide the info. I'm seeing ~50MB/s on the raw drive, and 3x that on
plain stripes, so I'm assuming that either the RAID-5 code is not
working well or I haven't set it up optimally.
--
bill davidsen <davidsen@xxxxxxx>
CTO TMR Associates, Inc
Doing interesting things with small computers since 1979
-
To unsubscribe from this list: send the line "unsubscribe linux-raid" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
