HP StorageWorks EVA Cluster Extension Software Administrator Guide (T3667-96045, April 2010)

1 EVA Cluster Extension features
HP StorageWorks EVA Cluster Extension offers protection against application downtime due to a
fault, failure, or site disaster by extending a local cluster between data centers over metropolitan
distance. EVA Cluster Extension reinstates critical applications at a remote site within minutes of an
adverse event, integrating your open-system clustering software and HP StorageWorks Continuous
Access EVA to automate failover and failback between sites. This dual integration enables the cluster
software to verify the status of the storage and the server cluster. The cluster software can then make
correct failover and failback decisions, thus minimizing downtime and accelerating recovery.
Integration into cluster software
EVA Cluster Extension Software provides tight integration with the cluster software and is managed
as a resource of the clustered application service (like a disk or IP address).
EVA Cluster Extension integrates with the following cluster software products:
• Microsoft Cluster Service (MSCS)
• SUSE Linux Enterprise High Availability Extension (SLE HA)
• Red Hat Cluster Suite (RHCS)
For supported cluster software versions, see the HP SPOCK website: http://www.hp.com/storage/
spock.
Graphical user interface
EVA Cluster Extension for Windows can be configured using the Cluster Administrator (Windows
Server 2003) or Failover Cluster Management (Windows Server 2008 /2008 R2) GUI. EVA Cluster
Extension offers full integration into the GUI so that you can easily set and change resource values.
NOTE:
For Linux environments, configuring EVA Cluster Extension resources with a GUI is not supported.
You must use an EVA Cluster Extension configuration file to configure EVA Cluster Extension resources.
CLI for easy integration
EVA Cluster Extension provides a CLI to enable disaster tolerant environments if no cluster software
is available for your operating system or if you want to integrate HP Continuous Access EVA with
your choice of cluster software.
This feature is useful if you use custom software to migrate application services from one system to
another or if you want EVA Cluster Extension to check the DR group member states to ensure that you
can automatically start your application service on the local storage system.
For detailed information, see “CLI commands and utilities” on page 87.
EVA Cluster Extension Software Administrator Guide 9