Managing Serviceguard Nineteenth Edition, Reprinted June 2011

For more details of IPv6 address format, see the Appendix H

(page 364).

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 66) for more information.

NETWORK_AUTO_FAILBACK See the NETWORK_AUTO_FAILBACK parameter description

under“Cluster Configuration Parameters ” (page 105).

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:

Table 6 SCSI Addressing in Cluster Configuration

Host Interface SCSI AddressSystem or Disk

7Primary System A

6Primary System B

5Primary System C

4Primary System D

3Disk #1

2Disk #2

1Disk #3

0Disk #4

15Disk #5

Hardware Planning 91