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Solaris Cluster 3.x 4.x Resource fails fail over or start due to allowable number of tries. Pingpong Avoidance Algorithms Explained (Doc ID 1003759.1)

Last updated on AUGUST 06, 2020

Applies to:

Solaris Cluster Geographic Edition - Version 3.0 to 4.3 [Release 3.0 to 4.3]
Solaris Cluster - Version 3.0 to 4.3 [Release 3.0 to 4.3]
Oracle Solaris on SPARC (64-bit)
Oracle Solaris on x86-64 (64-bit)

Goal

If a Solaris Cluster resource is allowed to restart when it keeps failing on nodes of a cluster and switching back and forth, the resource group is said to be pingpong-ing.

To prevent such circumstances, the cluster framework implements pingpong avoidance algorithms to prevent switching a resource group back to a node where it has already failed.

In Sun Cluster there are two pingpong avoidance algorithms:
These algorithms are the rebalance and  pingpong_check algorithms. The rebalance algorithm is triggered when the resource group fails to start whereas the pingpong_check is triggered when a fault monitor for one of resources in the resource group detects a failure after the resource group has been successfully started.

This document describes the algorithms and their associated resources, and gives a procedure to demonstrate the algorithms in action.

To troubleshoot such a situation refer to:
<Document 1020354.1> Solaris Cluster Why Resource Group or Resource is pingpong-ing (failover repeatedly) Between Node/System/Server

Solution

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In this Document
Goal
Solution
 Parameters
 - Pingpong_interval
 - RG_START_RETRY_MAX
 Algorithms
 - The rebalance algorithm
 - The pingpong_check algorithm
 Demonstrating the algorithms
 - Triggering the "rebalance" algorithm
 - Triggering the "pingpong_check" algorithm
References

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