James White from the Citrix Forum (This Thread) asked for a video of VM failover if the Pool Master dies, This was part of my testing to I will add the guide.

Very impressed by how well it works!!!

See the DRBD install guide for my setup.

So the Pool Master has failed and is unrecoverable - all your VM's are down - how to get them backup and running.

SSH onto a pool member (This will act as your new Pool Master)

- Convert your Member to a Master

$ xe pool-emergency-transition-to-master

- Recover connections to other member servers. (If Any)

$ xe pool-recover-slaves

- Verify the pool management has been restored

$ xe host-list

- Show the list of Pool members

$ xe host-list params=uuid,name-label,host-metrics-live

- Show the VM's from the Failed Server - You will see their state as "Running"

$ xe vm-list is-control-domain=false resident-on=UUID_of_failed_server

- Reset the powerstate for all VM's

$ xe vm-reset-powerstate resident-on=UUID_of_failed_server --force --multiple

Now all VM's will be visable on XenCenter - Login to the Member server IP (The new Master) and Start your VM's

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When you recover the old Master simply boot it up and recover the DRBD replication

restart DRBDon both servers

$ /etc/init.d/drbd restart

$ drbdadm -- --overwrite-data-of-peer primary drbd-sr1 (On the New Master server)

$ drbdadm primary drbd-sr1 (On the Old Master)

Let me know how it works for you.

Cheers, Joe