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GroupWise 7 Interoperability Guide
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Do the following to prepare partitions for use by GroupWise:
Delete any existing partitions. They are not the correct type for use with GroupWise.
Create private cluster container partitions. These partitions are cluster aware and prevent two
nodes from being active on the same partition at the same time.
29.8 Setting Up Node Fencing or Resource
Fencing
Although private cluster container partitions protect against two nodes being active on the same
partition, there are circumstances where the protection they offer is insufficient. For example, if each
of two nodes each think that the other node is dead, they might both write to the same partition and
cause damage to data on the shared partition.
To protect against the data damage that can be caused by two nodes writing to the same partition at
the same time, you should implement node fencing or resource fencing in your cluster. Node fencing
locks resources away from a node whose status is uncertain. Resource fencing ensures exclusive
access to a given resource and provides finer granularity, so that a node with uncertain status can still
be safely used under certain circumstances. In addition to node fencing and resource fencing, some
hardware provides self-fencing resources that take care of the problem for you.
There are numerous ways to implement fencing. The following Web sites offer additional
information about fencing:
Split-Brain (http://linux-ha.org/SplitBrain)
Fencing (http://linux-ha.org/fencing)
Node Fencing (STONITH) (http://linux-ha.org/STONITH)
Resource Fencing (http://linux-ha.org/ResourceFencing)
Self-Fencing Resources (http://linux-ha.org/SelfFencingResource)
29.9 What’s Next
Now that you have set up your Heartbeat cluster, you are ready to start installing your GroupWise
system.
Chapter 32, “Setting Up a Domain and a Post Office in a Heartbeat Cluster,” on page 307
Chapter 33, “Implementing the Internet Agent in a Heartbeat Cluster,” on page 325
Chapter 34, “Implementing WebAccess in a Heartbeat Cluster,” on page 343
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