Mscs Thresholds And Periods - Compaq ProLiant 1600 Administrator's Manual

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.