PowerHA SystemMirror linked cluster
A linked cluster is ideal for situations where each site is at a different geographical location. Typically, the sites are far enough apart so that they cannot conveniently share a common storage area network (SAN). Each site must have its own active repository disk, and any backup repositories. Linked clusters always use unicast to communicate between sites. Linked clusters are a useful part of high availability disaster recovery (HADR).
Cluster Aware AIX® (CAA) can use linked clusters to support multiple sites that are geographically far apart (in different cities). Linked clusters link the individual CAA clusters to the sites that are at different locations. The links between the sites are used for heartbeat and cluster communication.
You can use linked clusters for communication across short geographical distances, such as between different buildings within the same city.
Split policy options | Merge policy options | |||
---|---|---|---|---|
Majority | Priority | Tie-breaker | Manual | |
None | X | X | ||
Tie-breaker | X | |||
Manual | X |