Managing Serviceguard Eighteenth Edition, September 2010

• Configure networking and security (cmpreparecl)
• Create and start the cluster with a cluster lock device (cmdeploycl)
• Create and import volume groups as additional shared storage for use by cluster
packages (cmpreparestg)
Advantages of Easy Deployment
• Quick and simple way to create and start a cluster.
• Automates security and networking configuration that must always be done before
you configure nodes into a cluster.
• Simplifies cluster lock configuration.
• Simplifies creation of shared storage for packages.
Limitations of Easy Deployment
• Does not install or verify Serviceguard software
• Requires agile addressing for disks. See “About Device File Names (Device Special
Files)” (page 106).
• cmpreparestg (1m) will fail if cDSFs and persistent DSFs are mixed in a volume
group. See “About Cluster-wide Device Special Files (cDSFs)” (page 135) for more
information about cDSFs.
• Does not configure access control policies.
• Does not install or configure firewall and related software.
• Does not support cross-subnet or Metrocluster configurations.
• Does not configure packages (but can create a sample package).
• Does not discover or configure a quorum server (but can deploy one that is already
configured).
• Does not support asymmetric network configurations (in which only a subset of
nodes has access to a given subnet).
For more information and instructions, see “Using Easy Deployment” (page 210).
Heartbeat Subnet and Cluster Re-formation Time
The speed of cluster re-formation depends on the number of heartbeat subnets.
If the cluster has only a single heartbeat network, and a network card on that network
fails, heartbeats will be lost while the failure is being detected and the IP address is
being switched to a standby interface. The cluster may treat these lost heartbeats as a
failure and re-form without one or more nodes. To prevent this, a minimum
MEMBER_TIMEOUT value of 14 seconds is required for clusters with a single heartbeat
network.
If there is more than one heartbeat subnet, and there is a failure on one of them,
heartbeats will go through another, so you can configure a smaller MEMBER_TIMEOUT
value.
138 Planning and Documenting an HA Cluster