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Re: [dm-devel] Simulating faulty disk

Is there any way we can create a regular scsi device and then dynamically change its personality
to delay or flakey ?
Is there a way to dynamically change the parameters of flakey/delay device.

So we can start with no errors and then we can inject some errors.


On 10/21/2011 9:21 AM, Bryn M. Reeves wrote:
On 10/21/2011 04:13 PM, Yathindra wrote:
>mount -t ext3 /dev/sdb /mnt
Copied some data into /mnt
>dmsetup create d0 --table="0 `blockdev --getsize /dev/sdb` delay
/dev/sdb 0 500"
device-mapper: reload ioctl failed: Invalid argument
Command failed

You can't create a mapped device on something while it is mounted as device-mapper needs to open it exclusively.

But as seen from above, dmsetup is failing to create a flakey/delay
device when /dev/sdb
has a filesystem on top of it. Is there any workaround ?

Set up the file system the way you want it on sdb first. Then unmount it and create the device-mapper devices and mount that.


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