Compaq ProLiant 3000 Compaq ProLiant Cluster HA/F100 and HA/F200 Administrator - Page 69
MSCS Thresholds and Periods, Restart Threshold and Restart Period
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2-38 Compaq ProLiant Clusters HA/F100 and HA/F200 Administrator Guide You can use the Windows NT Performance Monitor to observe and track system performance. Some applications may also have their own internal performance measurement capabilities. MSCS Thresholds and Periods MSCS offers flexibility in configuring the initiation of failover events. For resources, MSCS allows you to set Restart Thresholds and Periods. For cluster groups, MSCS allows you to set Failover Thresholds and Periods. Restart Threshold and Restart Period A restart threshold defines the maximum number of times per restart period that MSCS attempts to restart a resource before failing over the resource and its corresponding cluster group. See the following example: Assume you have a disk resource (Disk1) that is part of a cluster group (Group1). You set the restart threshold to 5 and the restart period to 10. If the Disk1 resource fails, MSCS will attempt to restart the resource on the group's current cluster node five times within a 10-minute period. If the resource cannot be brought online within the 10-minute restart period, then Group1 will fail over to the partner cluster node. Note that MSCS waits the length of the restart period (for example, 10 minutes) before actually failing over the cluster group. You must assess the likelihood that the group will successfully restart on its present node against the time required to restart the cluster group before failing it over. If it is appropriate to immediately fail over any group that encounters a problem, set the restart threshold to 0 (zero). If the group will experience severe performance limitations if failed over to a secondary server, set the threshold and period so that MSCS attempts to restart the group on its preferred server.