Managing Serviceguard Fifteenth Edition, reprinted May 2008

Planning and Documenting an HA Cluster
Hardware Planning
Chapter 4136
Network Information
Serviceguard monitors LAN interfaces.
NOTE Serviceguard supports communication across routers between nodes in
the same cluster; for more information, see the documents listed under
“Cross-Subnet Configurations” on page 41.
Serviceguard communication relies on the exchange of DLPI (Data Link
Provider Interface) traffic at the data link layer (for nodes on the same
subnet) 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.
NOTE In a cross-subnet configuration, in which the cluster spans subnets
joined by a router, a standby for each subnet is required. See
“Cross-Subnet Configurations” on page 41 for more information.
HP recommends that you configure heartbeats on all subnets, including
those to be used for client data.
Collect the following information 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.