Managing HP Serviceguard for Linux, Tenth Edition, September 2012

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.
• Red Hat 5 clusters are not supported.
NOTE: This also applies if HOSTNAME_ADDRESS_FAMILY is set to IPv6; Red
Hat 5 supports only IPv4-only clusters.
• 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 159).
• 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 158) 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 27) for more information about such configurations.
• Virtual machines are 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 command, as described under “Configuring the Cluster” (page 179).
Cluster Configuration Planning 103