This fix finally makes it work... It was a horrible experience to wait 30 min for restart of my Ubuntu each time I reproduce the error for some reason ...
The common thing with Ubuntu is that when the "dd if=dev/zero..." hangs on snapshot removal, when system restart is invoked, the logs show an error unmounting the dev/mapper/dm-XX which are used for the snapshots, and this error prevents the system to fully restart. It's not quite obvious if 'dd' causes the device mapper hang, but it worths looking at this redhat thread probably.
This fix finally makes it work... It was a horrible experience to wait 30 min for restart of my Ubuntu each time I reproduce the error for some reason ...
Here is a similar problem in RedHat: www.redhat. com/archives/ linux-lvm/ 2012-June/ msg00022. html
http://
The common thing with Ubuntu is that when the "dd if=dev/zero..." hangs on snapshot removal, when system restart is invoked, the logs show an error unmounting the dev/mapper/dm-XX which are used for the snapshots, and this error prevents the system to fully restart. It's not quite obvious if 'dd' causes the device mapper hang, but it worths looking at this redhat thread probably.