HP-UX System Administrator's Guide: Overview HP-UX 11i v3 (B3921-90011, September 2010)

System Multi-node System Multi-node Packages run (simultaneously) on all nodes in
Serviceguard cluster. They remain running as long as all copies of
the package contents remain running. All copies of System Multi-node
packages halt if even one of the copies in the cluster halts. System
Multi-node packages do not fail over. HP supports them only for
specific applications.
Serviceguard clusters use TCP/IP networking services for reliable communication among nodes
in the cluster. This includes heartbeat messages (signals from each functioning node that are
central to the operation of the cluster).
Tools to Administer/Configure
Serviceguard clusters can be configured and managed using Serviceguard Manager or using
Serviceguard commands, including:
cmviewcl
View information about a high availability cluster
cmrunnode
Run a node in a high availability cluster
cmhaltnode
Halt a node in a high availability cluster
cmruncl
Run a high availability cluster
cmhaltcl
Halt a high availability cluster
How to Obtain
Serviceguard is included with the Mission Critical Operating Environment and with various
specialized mission-critical and virtualization bundles. Consult your HP Sales Representative
or an HP authorized reseller for more information.
For Further Information
The following Serviceguard document contains detailed information on configuring Serviceguard
clusters:
• Managing Serviceguard, Thirteenth Edition, B3936-90105
Other Cluster Types
Serviceguard clusters can be located in a single room or single building; additionally, they can
participate in clusters spread over vast distances. The distance between nodes largely determines
which form of clustering you are using.
More information about the following cluster types is available in the Business Support Center
at http://www.hp.com/go/hpux-serviceguard-docs.
Extended Distance Clusters
An extended distance cluster contains alternate nodes located in different data centers separated
by some distance. Extended distance clusters are connected using a high speed cable that
guarantees network access between the nodes as long as all guidelines for disaster tolerant
architecture are followed. The maximum distance between nodes in an extended distance cluster
is set by the limits of the data replication and networking technology used.
Sometimes referred to as an extended campus cluster, this cluster type services an area approximately
the size of a college or corporate campus.
Metropolitan Clusters
A metropolitan cluster is geographically dispersed within the confines of a metropolitan area
requiring right-of-way to lay cable for redundant network and data replication components.
Sometimes referred to by the shorter term metrocluster, this cluster type services an area
approximately the size of a town or city, or several closely located cities.
32 HP-UX Virtualization Technologies