Coping with a Pool Failure

There seems to be some confusion around how backup and restore functionality works in a resource pool, as opposed to a single host.

Always ensure that you periodically do a xe pool-dump-database on the master. Keep the resulting file in a safe location
This command should NOT be executed on a slave (member). This is a master-only command
On pool failure:
- Reinstall the master
- Ensure network, storage etc are set up correctly
- Do a xe pool-restore-database
- Join the pool slaves to the master

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