Roger Lucas wrote:
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:linux-raid-
[EMAIL PROTECTED] On Behalf Of Bill Davidsen
Sent: 30 November 2006 14:13
To: [email protected]
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 <[EMAIL PROTECTED]>
CTO TMR Associates, Inc
Doing interesting things with small computers since 1979
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