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HP OpenVMS Systemsask the wizard |
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The Question is: How to set automatic failover of application in OpenVMS Cluster V7.3-1? There are two DS20E machines in OpenVMS Cluster. First is "a working node" which is is running applications and IDA database. Second node is used for development and testing. In case that first node fail of crash, second one have to automaticaly failover application. Is there a (Unix) CAA like way to do it? The Answer is : OpenVMS applications can utilize comparatively primitive application fail-over, but can also easily provide for entirely parallel access. Failover can be implemented with batch jobs (restarts and related operations and support are available), with commercial or Freeware scheduling packages (see the FAQ), with the inherent process startup resulting from incoming network connections to cluster alias, and other approaches. Parallel access provides operations across multiple nodes within a cluster, typically using a protocol-specific cluster alias. Tru64 UNIX Cluster Application Availability (CAA) is most directly provided by a scheduling package, and various of these are available as commercial packages and as Freeware -- the OpenVMS FAQ has pointers. Ask The Wizard Topics: (2150), (1029), (391), likely others. Also (3531), (5870), (4602) and other topics provide supporting information. Batch (and print) queue-related lexical functions and DCL command procedures are discussed in various topics. Technical presentations on cluster application design tools and techniques are also available, as are the OpenVMS Programming Concepts and the Cluster manuals.
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