Managing Serviceguard Eighteenth Edition, September 2010

ip_address 15.244.56.100
ip_address 15.244.56.101
Configuring a Package: Next Steps
When you are ready to start configuring a package, proceed to Chapter 6: “Configuring
Packages and Their Services ” (page 279); start with “Choosing Package Modules”
(page 280). (If you find it helpful, you can assemble your package configuration data
ahead of time on a separate worksheet for each package; blank worksheets are in
Appendix E.)
Planning for Changes in Cluster Size
If you intend to add additional nodes to the cluster online (while it is running) ensure
that they are connected to the same heartbeat subnets and to the same lock disks as the
other cluster nodes. For cross-subnet considerations, see “Cross-Subnet Configurations”
(page 41).
In selecting a cluster lock configuration, be careful to anticipate any potential need for
additional cluster nodes. Remember that a cluster of more than four nodes must 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. See “Cluster Lock Planning” (page 129) for more
information.
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 (see “Cluster Configuration Parameters ” starting on (page 143)) is set high
enough to accommodate the total number of packages you will be using.
204 Planning and Documenting an HA Cluster