Web Agent HCO Failover cluster and threshold percentage relationship

Products

• CA Single Sign On Secure Proxy Server (SiteMinder)
• CA Single Sign On SOA Security Manager (SiteMinder)
• CA Single Sign-On
• CA Single Sign On Agents (SiteMinder)
• SITEMINDER

Issue/Introduction

 

The Failover Threshold is the number of Policy server that needs to be
active for the cluster to be active, if the number of Policy Servers
is below this number, the Web Agent will switch to the other cluster.

 

Resolution

 

The Failover Threashold number seen in the cluster definition tells
the number of Policy Servers that need to be up for the cluster to be
active.

To illustrate :

2 Policy Servers with a

  threashold percentage = 60%
  failover threadshold = 2

means that if 1 of the Policy Server is down, the number of Policy
Server available in the cluster is 1, which is lower than 2, so there
will be failover to the second cluster.

To keep the cluster active even if 1 Policy Server is down, set a
threshold below 50 % and the number will be 1.