HP StorageWorks Cluster Extension EVA (CLX EVA) is software that utilizes HP Continuous Access EVA and Microsoft Cluster Service to extend otherwise local cluster solutions over metropolitan distances. CLX EVA automates server cluster failover operations by synchronizing failover of EVA storage with replication management for a disaster tolerant solution for Microsoft Cluster Service on Windows 2003.

CLX EVA integrates into Microsoft Cluster Service on Windows 2003 and provides automatic failover capabilities by making the decision on whether it is appropriate for the cluster software to failover the application from one cluster node to another. CLX EVA also provides services such as swapping the personalities of the replicated disk pair to enable read/write access to the disaster recovery (DR) group LUNs when necessary.