HP Serviceguard for Linux Version A.11.19 Release Notes, July 2009

The default is IPv4. You can change it either by editing the cluster configuration file
and setting the appropriate value for the HOSTNAME_ADDRESS_FAMILY parameter,
or by using the new -a option of cmquerycl (1m). For more information, see “About
Hostname Address Families: IPv4-Only, IPv6-Only, and Mixed Mode” in Chapter 4 of
the latest version of Managing Serviceguard, at the address given under “Documents
for This Version ” (page 36).
Some restrictions apply, as follows.
Rules and Restrictions for IPv6-Only Mode
• You cannot use DNS or NIS for name resolution in an IPv6–only cluster.
• You cannot use WBEMProvider or the SNMP Subagent in an IPv6–only cluster.
• Red Hat 5 clusters are not supported.
NOTE: This also applies if HOSTNAME_ADDRESS_FAMILY is set to ANY; Red
Hat 5 supports only IPv4-only clusters.
• All addresses used by the cluster must be in each node's /etc/hosts file.
In addition, the file must contain the following entry:
::1 localhost ipv6-localhost ipv6-loopback
• All addresses must be IPv6, apart from the node's IPv4 loopback address, which
cannot be removed from /etc/hosts.
• The node's public LAN address (by which it is known to the outside world) must
be the last address listed in /etc/hosts.
Otherwise there is a possibility of the address being used even when it is not
configured into the cluster.
• You must use $SGCONF/cmclnodelist, not ~/.rhosts or /etc/hosts.equiv,
to provide root access to an unconfigured node.
NOTE: This also applies if HOSTNAME_ADDRESS_FAMILY is set to ANY. See
“Allowing Root Access to an Unconfigured Node” in Chapter 5 of Managing
Serviceguard for more information.
• If you use a Quorum Server, you must make sure that the Quorum Server hostname
(and the alternate Quorum Server address specified by QS_ADDR, if any) resolve
to IPv6 addresses.
16 Serviceguard for Linux Version A.11.19 Release Notes