(1) In z/OS and S/390 environments, a hardware- and software-based, remote-copy, service option that provides an asynchronous volume copy across storage subsystems for disaster recovery, device migration, and workload migration.
(2) A function of a storage server that assists a control programme to maintain a consistent copy of a logical volume (LVOL) on another storage facility. All modifications of the primary LVOL volume by any attached host are presented in order to a single host. The host then makes these modifications on the secondary LVOL. See also remote copy.