geom mirror write performance problem

[Pawel Jakub Dawidek]

On Wed, Dec 07, 2005 at 05:32:04PM +0100, OxY wrote:
+> here's my dmesg

Looks good. I was wondering if you don't have two disks on the same ATA
channel, but no.

I'd like you tu run a test, but don't see how it can be done without
destrying your mirror.
Basically, you should try running two parallel writes on you both disks.
Something like this:

#!/bin/sh
dd if=/dev/zero of=/dev/ad0 bs=1m count=1000 &
dd if=/dev/zero of=/dev/ad2 bs=1m count=1000 &
wait

And see how it compares to single write test.

-- 
Pawel Jakub Dawidek                       http://www.wheel.pl
pjd at FreeBSD.org                           http://www.FreeBSD.org
FreeBSD committer                         Am I Evil? Yes, I Am!
-------------- next part --------------
A non-text attachment was scrubbed...
Name: not available
Type: application/pgp-signature
Size: 187 bytes
Desc: not available
Url : http://lists.freebsd.org/pipermail/freebsd-geom/attachments/20051207/2f369cae/attachment.bin