Reference Guide

Understanding Your Failover Cluster 43
Adjusting the Threshold and Period Values
The Threshold value determines the number of attempts to restart the
resource before the resource fails over. The Period value assigns a time
requirement for the Threshold value to restart the resource.
If MSCS exceeds the maximum number of restart attempts within the
specified time period and the failed resource has not been restarted, MSCS
considers the resource to be failed.
NOTE: See "Setting Advanced Resource Properties" to configure the Looks Alive, Is
Alive, Threshold, and Period values for a particular resource.
NOTE: Do not adjust the Threshold and Period settings unless instructed by
technical support.
Configuring Failover
You can configure a resource to affect the group and fail over an entire group
to another node when a resource fails in that group. If the number of failover
attempts exceeds the group's threshold and the resource is still in a failed
state, MSCS attempts to restart the resource after a period of time specified
by the resource's Retry Period On Failure property.
NOTE: Do not adjust the Retry Period On Failure settings unless instructed by
technical support.
When you configure Retry Period On Failure, use the following guidelines:
• Select a unit value of minutes rather than milliseconds (the default value
is milliseconds).
• Select a value that is greater than or equal to the value of the resource’s
restart period property.