Configuration Concepts
This section describes some failure scenarios and provides guidelines on how to configure the agent in VCS.
Individual Component Failure
In a replicated data cluster, you can instruct VCS to give preference to hosts connected to the same array during failover. This avoids unnecessary TrueCopy failover or failback and is accomplished by creating system zones such that hosts attached to an array are part of the same system zone.
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In this sample, hosta and hostb are in one system zone, and hostc and hostd are in another system zone. The SystemZones attribute enables you to create these zones.
You can modify the SystemZones attribute using the following command:
# hagrp -modify grpname SystemZones hosta 0 hostb 0 hostc 1 hostd 1
The variable grpname represents the service group in the cluster.
This command creates two system zones: zone 0 with hosta and host b, zone 1 with hostc and hostd.
System zones are not required in global clusters because failover will occur on a remote cluster if all local targets have been exhausted.
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