Brocade Communications Systems StorageWorks 4400 - Enterprise Virtual Array Instrukcja Użytkownika Pobierz pdf (Strona 14)

Figure 5. Add member to a DR group

Present the destination virtual disks

Once all the Vdisks are added to the DR group, the Vdisk replicas on the destination array must be

presented to the application servers on the remote site. The replicas are marked as read-only to the

remote hosts until failover occurs.

After the Vdisks are presented to the remote hosts, use Windows Failover Cluster Manager add node

functionality to join the remote nodes to the SQL Server cluster.

For more information, see the HP StorageWorks Continuous Access EVA implementation guide.

Implementing disaster tolerance with Cluster Extension EVA

Cluster Extension EVA integrates with the Microsoft Cluster Service and Continuous Access to allow

access to the remote data copy if an application failover occurs. In a SharePoint environment, it is

installed on each of the SQL Server cluster nodes and is configured by adding CLX as a cluster

resource to each SQL Server application cluster group from within the Windows Failover Cluster

Manager. CLX installation and configuration can be performed in just a few minutes and does not

require application downtime for installation; however, during testing, the application is unavailable

for approximately 10 minutes while the application cluster groups are failed over to each of the four

SQL Server cluster nodes to verify installation.

Prerequisites

 Ensure that the following conditions are met before installing EVA Cluster Extension Software:

o Continuous Access EVA links are redundant and bidirectional.

o Alternate I/O paths between servers and the EVA storage system are set up.

o The cluster nodes in your zoning configuration each recognize their respective (local) EVA,

but not the remote EVA. Each management server recognizes both EVAs and can recognize

each other. Figure 6 shows a zoning example.

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Brocade Communications Systems StorageWorks 4400 - Enterprise Virtual Array Instrukcja Użytkownika Strona 14