Managing Serviceguard 14th Edition, June 2007

Building an HA Cluster Configuration
Preparing Your Systems
Chapter 5 221
Preparing 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. 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 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.
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.
Creating the Storage Infrastructure and Filesystems
with LVM and VxVM
In addition to configuring the cluster, you create the appropriate logical
volume infrastructure to provide access to data from different nodes.
This is done several ways:
• for Logical Volume Manager, see “Creating a Storage Infrastructure
with LVM” on page 222
• for Veritas Volume Manager See “Creating a Storage Infrastructure
with VxVM” on page 228
• for Veritas Cluster File System with CVM (on systems that support
it), See “Creating a Storage Infrastructure with Veritas Cluster File
System (CFS)” on page 245
• for Veritas Cluster Volume Manager (on systems that support it), see
“Creating the Storage Infrastructure and Filesystems with Veritas
Cluster Volume Manager (CVM)” on page 256
You can also use a mixture of volume types, depending on your needs.
LVM and VxVM configuration is done before configuring the cluster.
CVM and CFS configuration is done after configuring the cluster.