Compaq ProLiant Cluster HA/F500 Enhanced DT Supplement

Disaster Recovery
3-2 ProLiant Cluster HA/F500 for MA8000 Enhanced DT Supplement Guide
COMPAQ CONFIDENTIAL
Writer: Woody Jernigan File Name: d-ch3 Disaster Recovery
Codename: Chargers Part Number: 165103-004 Last Saved On: 7/30/02 9:28 AM
MSCS Resource Failover and Failback
A normal MSCS failover occurs if a cluster resource fails at the site (refer to
Figure 3-1). The exact failover behavior can be configured for each cluster group, but
usually this means that the entire cluster group that contains the failed resource may
attempt to switch to the other cluster node. No storage subsystem failover is required
in this situation.
Use the standard failback mechanisms provided by MSCS to perform a failback after
a resource failure. There is no storage failback in this situation because no storage
subsystem failover occurred.
SITE 1 SITE 2
Figure 3-1: Microsoft cluster management software
resource or server failure
Local Server Failure
A normal MSCS failover occurs if one of the cluster nodes fails. All of
the resources defined in the cluster groups that were running on the failed node will
attempt to switch over to the surviving nodes. As with a cluster resource failure, no
storage subsystem failover is required. This is also the case when a cluster node is
brought down for a scheduled event, such as system maintenance.