Brocade Communications Systems StorageWorks 4400 - Enterprise Virtual Array Manual de usuario descargar pdf (Pagina 20)

Figure 11. Failover/Failback resource property

Disaster recovery

Cluster node recovery (failback)

Because there is no disruption to the SAN or intersite links in either the Site A single node failure

scenario or the Site A all node failure scenario, the SQL Server application can be manually moved

back to the original nodes on Site A. Once the nodes in Site A are back online, you can manually

move the SQL Server application by using Windows Failover Cluster Manager and HP CLX EVA.

Manual failback is performed by using Windows Failover Cluster Manager, which takes the SQL

Server instance offline and brings it back online on Site A. During testing, it took less than 1 minute to

perform manual failback.

For maximum SQL Server instance availability, allow resynchronization to complete before attempting

to move the SQL cluster group back to Site A. Otherwise, the SQL Server instance remains offline until

resynchronization completes.

During the failover operation, HP CLX EVA reverses the data replication direction of the disk resources

to replicate from Site A to Site B, thus returning the source/destination relationship of the DR group to

its pre-failure state.

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Brocade Communications Systems StorageWorks 4400 - Enterprise Virtual Array Manual de usuario Pagina 20