Heartbeat; Tolerance; Master Watchdog; Slave Watchdog - Novell OPEN ENTERPRISE SERVER 2 SP 2 - CLUSTER SERVICES 1.8.7 FOR LINUX Manual

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6 Click Apply or OK to save changes.

7 Restart all nodes in the cluster to make the changes take effect.

7.3.1 Heartbeat

Heartbeat specifies the amount of time between transmits for all nodes in the cluster except the

master. For example, if you set this value to 1, non-master nodes in the cluster send a signal that they

are alive to the master node every second.

7.3.2 Tolerance

Tolerance specifies the amount of time the master node gives all other nodes in the cluster to signal

that they are alive. For example, setting this value to 4 means that if the master node does not receive

an "I'm alive" signal from a node in the cluster within four seconds, that node is removed from the

cluster.

7.3.3 Master Watchdog

Master Watchdog specifies the amount of time between transmits for the master node in the cluster.

For example, if you set this value to 1, the master node in the cluster transmits an "I'm alive" signal

to all the other nodes in the cluster every second.

If you are using multipath I/O to manage multiple paths between the server and the shared drive,

make sure that you allow sufficient time in the watchdog setting for a path failover to avoid

unnecessary cluster resource failovers between nodes. Test the failover time of the MPIO solution

you are using, then adjust the watchdog setting upward accordingly.

7.3.4 Slave Watchdog

Slave Watchdog specifies the amount of time the master node has to signal that it is alive. For

example, setting this value to 5 means that if the non-master nodes in the cluster do not receive an

"I'm alive" signal from the master within five seconds, the master node is removed from the cluster

and one of the other nodes becomes the master node.

If you are using multipath I/O to manage multiple paths between the server and the shared drive,

make sure that you allow sufficient time in the watchdog setting for a path failover to avoid

unnecessary cluster resource failovers between nodes. Test the failover time of the MPIO solution

you are using, then adjust the watchdog setting upward accordingly.

7.3.5 Maximum Retransmits

This value is set by default, and should not be changed.

OES 2 SP2: Novell Cluster Services 1.8.7 for Linux Administration Guide

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