High-Availability Vocabulary (Part II)
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- Active-Passive Cluster - A cluster where only one node runs a given
service at a time, and the other nodes are in stand-by to take over,
should the need arise.
- Active-Active Cluster - A cluster where a given service is running on more
then one machine at the same time.
- Fail-over - the operation of moving the service from one cluster node
- I/O fencing - a mechanism used in active-passive clusters, to ensure that
no matter what - at most one node will send I/O requests to a given disk.