Re: Simulating faulty disk

Bryn M. Reeves
2011-10-20T17:40:34Z

On 10/20/2011 05:46 PM, Yathindra wrote:
> >dmsetup create d0 --table="0 `blockdev --getsize /dev/sdb` delay
> /dev/sdb 0 500"
> device-mapper: reload ioctl failed: Invalid argument
> Command failed
>
> In /var/log/messages I see this,
> device-mapper: ioctl: error adding target to table

I don't see this here:

# dmsetup create d0 --table="0 `blockdev --getsize /dev/sdb` delay
/dev/sdb 0 500"
# dmsetup info -c d0
Name Maj Min Stat Open Targ Event UUID

d0 253 3 L--w 1 1 0
# dmsetup create f0 --table="0 `blockdev --getsize /dev/mapper/d0`
flakey /dev/mapper/d0 0 9 1"
# dmsetup info -c f0
Name Maj Min Stat Open Targ Event UUID

f0 253 4 L--w 0 1 0

This is using the f15 2.6.40.3 (aka kernel-3.0) with a locally compiled
dm-delay since it's not enabled in the Fedora kernels.

Might want to move this thread over to dm-devel if you're having trouble
with it.

Regards,
Bryn.