[Xen-users] Safe iSCSI & Live Migrations

[Simon Capstick <simon@xxxxxxxxxxxxxxxx>]

I'm currently playing with iSCSI and Xen (exporting individual DomU 
block devices as individual iSCSI disks) and wanted to find a safe way 
to use iSCSI. i.e. I want to prevent the accidental mounting of an iSCSI 
disk from two or more machines.  Using IET as an iSCSI target I can set 
MaxConnections=1 in the config.  This ensures that no accidental 
filesystem corruption happens due to two or more simultaneous mounts. 
However live migration is out of the question.  To move a DomU from one 
box to another with the MaxConnections=1 safeguard I have to;
Box 1:
Shutdown the DomU.
Perform an iSCSI logout.

Box 2:
Perform an iSCSI login.
Start the DomU.

Is there any way to perform a live migration of the above by getting Xen 
to run iSCSI logout/login scripts as the DomU pauses in the middle of 
the live migration?  Are there any software hooks that can be used to do 
this?
Or are there simpler methods to guarantee the safe/single use of iSCSI 
disks that still allow Xen's live migration?
Simon

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