Disaster Tolerance and Recovery in a Serviceguard Cluster
Understanding Types of Disaster Tolerant Clusters
Cluster Extension (CLX) Cluster
A Linux CLX cluster is similar to an
The architectural requirements are the same as for an extended distance cluster, with the additional constraint of a third location for arbitrator node(s) or quorum server. And as with an extended distance cluster, the distance separating the nodes in a metropolitan cluster is limited by the data replication and network technology available.
In addition, there is no hard requirement on how far the third location has to be from the two main data centers. The third location can be as close as the room next door with its own power source or can be as far as in a site across town. The distance between all three locations dictates the level of disaster tolerance a metropolitan cluster can provide.
On Linux, the metropolitan cluster is implemented using CLX.
•CLX for XP
•CLX for EVA
For
•Metrocluster with Continuous Access XP
•Metrocluster with Continuous Access EVA
•Metrocluster with EMC SRDF
The above
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