How and when to use the ProxyAgent for VERITAS Cluster Server (VCS).
The ProxyAgent is used to replicate the state of one resource in a service group into another service group. For instance, it is normal to have IP resources depend on NIC resources in service groups. Instead of having three or four NIC resources testing the same network interface every sixty seconds, a ProxyAgent could be used to replicate the state of one NIC resource. In terms of system load there would be one check to determine if the network interface was active and the other service groups would have a ProxyAgent reflecting the state. In the event of a fault of the NIC resource the ProxyAgent would fault on that system as well, producing the same behavior. The ProxyAgent is best used to replicate None resources, None means VCS has no control over either starting or stopping.
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