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Extended Remote Copy or XRC is an IBM zSeries and System z9 mainframe computer technology for data replication. It combines supported hardware and z/OS software to provide asynchronous replication over long distances. It is complementary to IBM's Peer to Peer Remote Copy service, which is designed to operate either synchronously or asynchronously over shorter distances.
XRC as a z/OS copy services solution can be compared to Global Mirror for ESS, which is a controller-based solution for either the open systems or z/Series environments. Both Global Mirror for ESS and XRC are asynchronous replication technologies, although their implementations are somewhat different.
Extended Remote Copy or XRC is now known as Global Mirror for z/Series.
XRC is a z/Series asynchronous disk mirroring technique which is effective over any distance. It keeps the data time consistent across multiple ESS or HDS disk subsystems at the recovery site.