Veritas Volume Manager 5.0.1 Administrator's Guide, HP-UX 11i v3, First Edition, November 2009

to resolve manually. This section and following sections describe how such a
condition can occur, and how to correct it. (When the condition occurs in a cluster
that has been split, it is usually referred to as a serial split brain condition).
Example of a serial split brain condition in a cluster
This section presents an example of how a serial split brain condition might occur
for a shared disk group in a cluster. Conflicts between configuration copies can
also occur for private disk groups in clustered and non-clustered configurations
where the disk groups have been partially imported on different systems.
A campus cluster (also known as a stretch cluster or remote mirror configuration)
typically consists of a 2-node cluster where each component (server, switch and
storage) of the cluster exists in a separate building.
Figure 4-1 shows a 2-node cluster with node 0, a fibre channel switch and disk
enclosure enc0 in building A, and node 1, another switch and enclosure enc1 in
building B.
Figure 4-1
Typical arrangement of a 2-node campus cluster
Fibre Channel switches
Disk enclosures
enc1enc0
Node 0
Redundant private
network
Node 1
Building A Building B
Creating and administering disk groups
Handling conflicting configuration copies
222