Re: "Misbehaving" hard disk (and no RAIDframe problem at all)

[Matthias Scheler <tron%zhadum.org.uk@localhost>]

On Sun, Jan 11, 2009 at 11:18:41PM +0000, Matthias Scheler wrote:
> tron@colwyn:~tron#dd if=/dev/rwd2d bs=1024k count=256 of=/dev/null
> 256+0 records in
> 256+0 records out
> 268435456 bytes transferred in 3.457 secs (77649828 bytes/sec)
> tron@colwyn:~tron#dd if=/dev/rwd3d bs=1024k count=256 of=/dev/null
> 256+0 records in
> 256+0 records out
> 268435456 bytes transferred in 3.475 secs (77247613 bytes/sec)

I've unconfigured the RAID and test write performance on the
individual disks:

tron@colwyn:/home/tron#dd if=/dev/zero of=/dev/rwd2d bs=1024k count=256
256+0 records in
256+0 records out
268435456 bytes transferred in 37.620 secs (7135445 bytes/sec)
tron@colwyn:/home/tron#dd if=/dev/zero of=/dev/rwd3d bs=1024k count=256
256+0 records in
256+0 records out
268435456 bytes transferred in 3.661 secs (73322987 bytes/sec)

"wd2" is indeed very slow, not sure why. Any ideas how to diagnose
the problem?

        Kind regards

-- 
Matthias Scheler                                  http://zhadum.org.uk/