VMware Site Recovery Manager (SRM) allows two vCenters to be run in an active passive setup. VM's can be failed over from one site to the other for disaster recovery (DR) and other purposes. To support this fail-over capability when using an Hitachi block storage array for vCenter datastores, the Hitachi Ops Center Protector Adapter for VMware Site Recovery Manager (a Storage Replication Adaptor in VMware parlance) is provided to enable SRM to query and fail-over the storage arrays via Protector.