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Disaster tolerance scenarios
This section describes the disaster tolerance scenarios used in testing, including definitions of
configurable options that control the behavior of failover events. Using the examples in this section,
administrators may configure available options specifically for their business requirements.
Site A cluster node failure
The test environment uses Windows Failover Cluster Manager to set the order of preferred owners for
SharePoint’s SQL back end, as shown in Figure 9. In the event of a Site A cluster node failure, the
applications will fail over to the remaining local (Site A) SQL Server node before attempting a site-to-
site failover. A local failover occurs within seconds.
Figure 9. Set the order of preferred owners in SQL application cluster
Site A all node failure
When all cluster nodes in Site A fail, the node failures trigger the SQL Server cluster to fail over to Site
B. During testing, this failure is created ejecting both Site A SQL Server nodes.
During the failover process, CLX EVA cluster resource for the SQL Server disk resources fails over the
Continuous Access EVA data replication direction for the DR group. The result is that the DR group on
Site B is placed in source mode and the DR group on Site A is placed in destination mode. Once SQL
Server is back online, transactions can resume, with all data now replicating from Site B to Site A. For
this type of failover scenario, the user-defined parameters for the HP CLX EVA resource have no effect
on failover behavior or takeover action.
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