Managing Serviceguard A.11.20, March 2013

Rules and Restrictions for Mixed Mode
IMPORTANT: See the latest version of the Serviceguard release notes for the most current
information on these and other restrictions.
• The hostname resolution file on each node (for example, /etc/hosts) must contain entries
for all the IPv4 and IPv6 addresses used throughout the cluster, including all STATIONARY_IP
and HEARTBEAT_IP addresses as well any private addresses. There must be at least one
IPv4 address in this file (in the case of /etc/hosts, the IPv4 loopback address cannot be
removed).
In addition, the file must contain the following entry:
::1 localhost ipv6-localhost ipv6-loopback
For more information and recommendations about hostname resolution, see “Configuring
Name Resolution” (page 173).
• You must use $SGCONF/cmclnodelist, not ~/.rhosts or /etc/hosts.equiv, to
provide root access to an unconfigured node.
See “Allowing Root Access to an Unconfigured Node” (page 171) for more information.
• Hostname aliases are not supported for IPv6 addresses, because of operating system limitations.
NOTE: This applies to all IPv6 addresses, whether HOSTNAME_ADDRESS_FAMILY is set to
IPV6 or ANY.
• Cross-subnet configurations are not supported.
This also applies if HOSTNAME_ADDRESS_FAMILY is set to IPV6. See “Cross-Subnet
Configurations” (page 29) for more information.
• VxVM, VxFS, and CVM/CFS are supported on HP Serviceguard A.11.20 April 2011 patches
with Veritas Storage Foundation™ 5.1 SP1 and later.
NOTE: This also applies if HOSTNAME_ADDRESS_FAMILY is set to IPV6.
• HPVM is not supported.
You cannot have a virtual machine that is either a node or a package if
HOSTNAME_ADDRESS_FAMILY is set to ANY or IPV6.
Cluster Configuration Parameters
You need to define a set of cluster parameters. These are stored in the binary cluster configuration
file, which is distributed to each node in the cluster. You configure these parameters by editing the
cluster configuration template file created by means of the cmquerycl (1m) command, as
described under “Configuring the Cluster ” (page 190).
NOTE: See “Reconfiguring a Cluster” (page 296) for a summary of changes you can make while
the cluster is running.
The following parameters must be configured:
CLUSTER_NAME The name of the cluster as it will appear in the output of
cmviewcl and other commands, and as it appears in the
cluster configuration file.
The cluster name must not contain any of the following
characters: space, slash (/), backslash (\), and asterisk (*).
114 Planning and Documenting an HA Cluster