[Linux-cluster] Question about KVM and cluster

[Nicolas Ross]

We have 2 distinct clusters in 2 different server rooms for HA perposes. 
So services in culster A have a replica in cluster B. Files from 
services are rsync periodicly on the other server room.

At about every week or so, we switch the running production services 
from one room to another. This is working perfectly for now.

Now, I need to add a KVM virtual machine to the mix. I will then create 
a VM on cluster A, with it's data residing on the fiberchannel raid 
arrays via lvm. The VM will (I hope so) migrate from one machine to 
another within the same cluster when there's a failure or other. But 
what about migrate it to another server room ? Is this possible ? Is 
there a way to replicate at the block-level a lvm volume ? What are my 
other options ?

My other option would be to have a 2 VMs, 1 in each room, and rsync data 
inside the VMs, but I would like to avoir this.

Best regards.