Managing HP Serviceguard for Linux, Tenth Edition, September 2012

• electrical points of failure.
• application points of failure.
Serviceguard Memory Requirements
Serviceguard requires approximately 15.5 MB of lockable memory.
Planning for Expansion
When you first set up the cluster, you indicate a set of nodes and define a group of
packages for the initial configuration. At a later time, you may wish to add additional
nodes and packages, or you may wish to use additional disk hardware for shared data
storage. If you intend to expand your cluster without having to bring it down, you need
to plan the initial configuration carefully. Use the following guidelines:
• Set the Maximum Configured Packages parameter (described later in this chapter
under “Cluster Configuration Planning ” (page 99)) high enough to accommodate
the additional packages you plan to add.
• Networks should be pre-configured into the cluster configuration if they will be
needed for packages you will add later while the cluster is running. See “LAN
Information ” (page 93).
See Chapter 7: “Cluster and Package Maintenance” (page 233), for more information
about changing the cluster configuration dynamically, that is, while the cluster is running.
Hardware Planning
Hardware planning requires examining the physical hardware itself. One useful procedure
is to sketch the hardware configuration in a diagram that shows adapter cards and
buses, cabling, disks and peripherals.
You may also find it useful to record the information on the Hardware worksheet (page 323)
indicating which device adapters occupy which slots and updating the details as you
create the cluster configuration. Use one form for each node (server).
SPU Information
SPU information includes the basic characteristics of the server systems you are using in
the cluster.
You may want to record the following on the Hardware worksheet (page 323) :
Server Series Number Enter the series number, for example, DL380 G5.
Host Name Enter the name to be used on the system as the host
name.
Memory Capacity Enter the memory in MB.
Number of I/O slots Indicate the number of slots.
92 Planning and Documenting an HA Cluster