Managing Serviceguard 14th Edition, June 2007

Planning and Documenting an HA Cluster
Hardware Planning
Chapter 4136
Serviceguard communication relies on the exchange of DLPI (Data Link
Provider Interface) traffic at the data link layer and the UDP/TCP (User
Datagram Protocol/Transmission Control Protocol) traffic at the
Transport layer between cluster nodes.
LAN Information
While a minimum of one LAN interface per subnet is required, at least
two LAN interfaces, one primary and one or more standby, are needed to
eliminate single points of network failure.
It is recommended that you configure heartbeats on all subnets,
including those to be used for client data. On the worksheet, enter the
following for each LAN interface:
Subnet Name
Enter the IP address mask for the subnet. Note that
heartbeat IP addresses must be on the same subnet on
each node.
Interface Name
Enter the name of the LAN card as used by this node to
access the subnet. This name is shown by lanscan
after you install the card.
IP Address
Enter this node’s host IP address(es), to be used on this
interface. If the interface is a standby and does not
have an IP address, enter 'Standby.'
An IPv4 address is a string of 4 digits separated with
decimals, in this form:
nnn.nnn.nnn.nnn
An IPV6 address is a string of 8 hexadecimal values
separated with colons, in this form:
xxx:xxx:xxx:xxx:xxx:xxx:xxx:xxx.
For more details of IPv6 address format, see the
Appendix , “IPv6 Address Types,” on page 506
NETWORK_FAILURE_DETECTION