HP Serviceguard manual SPU Information, Network Information, LAN Information, Nnn.nnn.nnn.nnn

slots, and the bus address for each adapter; you can update the details as you do the cluster configuration (described in Chapter 5).

SPU Information

SPU information includes the basic characteristics of the systems you are using in the cluster. Different models of computers can be mixed in the same cluster. This configuration model also applies to HP Integrity servers. HP-UX workstations are not supported for Serviceguard.

Collect information for the following items; see the Hardware Configuration Worksheet (page 97) for an example:

Server Number	The series number; for example, rp8400 or rx8620-32.
Host Name	The name to be used on the system as the host name.
Memory Capacity	The memory in MB.
Number of I/O slots	The number of slots.

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” (page 30).

Serviceguard communication relies on the exchange of DLPI (Data Link Provider Interface) traffic (for nodes on the same subnet) and UDP/TCP (User Datagram Protocol/Transmission Control Protocol) and ICMP traffic 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” (page 30) 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; see the Hardware Configuration Worksheet (page 97) for an example:

Subnet Name	The IP address mask for the subnet. Note that, except in
	cross-subnet configurations (page 30), heartbeat IP
	addresses must be on the same subnet on each node.
Interface Name	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	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.

94 Planning and Documenting an HA Cluster