XenServer resource pool requirements
A pool always has at least one physical host, known as the "pool master", that provides a single point of contact for all of the servers in the pool, known as "slaves", managing communication to other members of the pool as necessary.
If the pool master is shut down or unavailable, you will not able to connect to the pool until the master is online again or until you nominate one of the other members as the new pool master for the pool. Virtual machines that are started at the time the pool master became unavailable continue running. Note that every member of a resource pool contains all the information necessary to take on the role of master, if you need to replace a pool master.
Note
If the pool's master fails, ...
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