Managing Serviceguard 11th Edition, Version A.11.16, Second Printing June 2004

Building an HA Cluster Configuration
Preparing Your Systems
Chapter 5 195
nodes may not use a lock disk, but a two-node cluster must use a cluster
lock. Thus, if you will eventually need five nodes, you should build an
initial configuration that uses a quorum server.
If you intend to remove a node from the cluster configuration while the
cluster is running, ensure that the resulting cluster configuration will
still conform to the rules for cluster locks described above.
To facilitate moving nodes in and out of the cluster configuration, you
can use SCSI cables with inline terminators, which allow a node to be
removed from the bus without breaking SCSI termination. See the
section “Online Hardware Maintenance with In-line SCSI Terminator”
in the “Troubleshooting” chapter for more information on inline SCSI
terminators.
If you are planning to add a node online, and a package will run on the
new node, ensure that any existing cluster bound volume groups for the
package have been imported to the new node. Also, ensure that the
MAX_CONFIGURED_PACKAGES parameter is set high enough to
accommodate the total number of packages you will be using.