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Re: [dm-devel] Simulating faulty disk



Hi Bryn,

I compiled a fresh kernel and enabled flakey and delay modules. Now am able to create disks but
it fails to mount.

dmsetup create d0 --table="0 `blockdev --getsize /dev/sdb` delay /dev/sdb 0 500" dmsetup create f0 --table="0 `blockdev --getsize /dev/mapper/d0` flakey /dev/mapper/d0 0 9 1"
mkfs -t ext3 /dev/mapper/f0
...
...
ext2fs_mkdir: Attempt to read block from filesystem resulted in short read while creating root dir

Can we even mount such a device ?

Thanks,
Yathi



On 10/20/2011 11:40 AM, Bryn M. Reeves wrote:
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.


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