Ok :) Bryn is there a more elaborate document which shows simple examples
to work with device mapper. For a newbie like me it would be really helpful.
Thanks,
Yathi
On 10/21/2011 8:56 AM, Bryn M. Reeves wrote:
On 10/21/2011 03:47 PM, Yathindra wrote:
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 ?
It's a flakey device :)
With that table you'll have a device that is failing write I/Os for 1s
in every ten. If that coincides with mkfs trying to write to the
device it will create a corrupted file system.
Depending on what you are trying to test you may want to put data on
the device first.
Regards,
Bryn.
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