Managing Serviceguard Sixteenth Edition, March 2009

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 G (page 433).
NETWORK_FAILURE_DETECTION
When there is a primary and a standby network
card, Serviceguard needs to determine when a
card has failed, so it knows whether to fail traffic
over to the other card. The configuration file
specifies one of two ways to decide when the
network interface card has failed:
• INOUT
• INONLY_OR_INOUT
The default is INOUT.
See “Monitoring LAN Interfaces and Detecting
Failure: Link Level” (page 93) for more
information.
NETWORK_AUTO_FAILBACK
See the NETWORK_AUTO_FAILBACK parameter
description under“Cluster Configuration
Parameters ” (page 138).
Kind of LAN Traffic
Identify the purpose of the subnet. Valid types
include the following:
• Heartbeat
• Client Traffic
• Standby
This information is used in creating the subnet groupings and identifying the IP
addresses used in the cluster and package configuration files.
Setting SCSI Addresses for the Largest Expected Cluster Size
SCSI standards define priority according to SCSI address. To prevent controller
starvation on the SPU, the SCSI interface cards must be configured at the highest
priorities. Therefore, when configuring a highly available cluster, you should give
nodes the highest priority SCSI addresses, and give disks addresses of lesser priority.
For SCSI, high priority starts at seven, goes down to zero, and then goes from 15 to
eight. Therefore, seven is the highest priority and eight is the lowest priority. For
example, if there will be a maximum of four nodes in the cluster, and all four systems
will share a string of disks, then the SCSI address must be uniquely set on the interface
cards in all four systems, and must be high priority addresses. So the addressing for
the systems and disks would be as follows:
Hardware Planning 127