root@h4:~# gnt-instance replace-disks  -n h6 lilia
Sun Oct 14 21:14:10 2012 Replacing disk(s) 0 for lilia.tetaneutral.net
Sun Oct 14 21:14:10 2012 STEP 1/6 Check device existence
Sun Oct 14 21:14:10 2012  - INFO: Checking disk/0 on h4.tetaneutral.net
Sun Oct 14 21:14:12 2012  - INFO: Checking volume groups
Sun Oct 14 21:14:12 2012 STEP 2/6 Check peer consistency
Sun Oct 14 21:14:12 2012  - INFO: Checking disk/0 consistency on node h4.tetaneutral.net
Sun Oct 14 21:14:12 2012 STEP 3/6 Allocate new storage
Sun Oct 14 21:14:12 2012  - INFO: Adding new local storage on h6.tetaneutral.net for disk/0
Sun Oct 14 21:14:12 2012 STEP 4/6 Changing drbd configuration
Sun Oct 14 21:14:12 2012  - INFO: activating a new drbd on h6.tetaneutral.net for disk/0
Sun Oct 14 21:14:13 2012  - INFO: Shutting down drbd for disk/0 on old node
Sun Oct 14 21:18:16 2012  - INFO: Detaching primary drbds from the network (=> standalone)
Failure: command execution error:
Can't detach the disks from the network on old node: Can't change network configuration to standalone mode: drbd43: can't shutdown network, even after multiple retries
root@h4:~#