Managing Serviceguard Eighteenth Edition, September 2010

• Make sure all the subnets used by the prospective nodes are accessible to all the
nodes.
Easy Deployment commands will fail if they detect an asymmetric network
configuration, in which only a subset of nodes has access to a given subnet.
• Make sure that the LAN or LANs that will be used for the cluster heartbeat meet
high-availability requirements.
See the requirements for HEARTBEAT_IP listed under “Cluster Configuration
Parameters ” (page 143), and the networking“Rules and Restrictions” (page 39).
In addition, HP recommends that you do not rely only on the site LAN, or any
busy LAN, for the cluster heartbeat.
For a discussion of cluster networking topology, see “Redundant Ethernet
Configuration ” (page 40).
NOTE: You cannot use the Easy Deployment commands to create a cross-subnet
configuration, as described under “Cross-Subnet Configurations” (page 41).
• If you have not already done so, set up ssh public/private key pairs on each node.
This will allow the Easy Deployment commands to operate on all the prospective
nodes before cluster is formed. If you need to set up the keys, you can use DSAU
to simplify the task; for an example, see “Creating cDSFs for a Group of Nodes”
(page 207).
• If you will be using a lock LUN (as opposed to an LVM lock disk or a quorum
server) set up the LUN partition before running cmdeploycl; see “Setting Up a
Lock LUN” (page 226).
• If you will be using individual disks (as opposed to RAID) for package data, and
you will be mirroring them with MirrorDisk/UX as HP recommends, make sure
the hardware is configured so as to allow PVG-strict mirroring.
For more information, see “Using Mirrored Individual Data Disks” (page 232) —
and it is good idea to read the entire section on “Creating a Storage Infrastructure
with LVM” (page 231) so that you understand what cmpreparestg is doing.
• Make sure you have read and understood the additional limitations spelled out
under “About Easy Deployment” (page 137); and it is a good idea to read the Easy
Deployment manpages (cmpreparecl (1m), cmdeploycl (1m), and
cmpreparestg (1m)) as well.
Using Easy Deployment Commands to Configure the Cluster
The examples that follow configure a two-node cluster with an LVM lock disk and a
logical volume (with PVG-strict mirroring) for use by packages. For more information,
and other options, see the manpages for cmpreparecl (1m), cmdeploycl (1m),
and cmpreparestg (1m).
Preparing Your Systems 211