Consistency group formation method for disaster recovery and shadowing method of record update, main system, remote data shadowing system and asynchronous remote data replication system

摘要

Remote data shadowing systems provide real-time disaster recovery capabilities. Updating records at the primary site causes write I / O operations to the storage subsystem. Record I / O operations are timestamped, and the physical location of time, sequence, and record updates is collected in the primary data mover. The primary data mover groups the recorder updates and associated control information based on a predetermined time interval and appends a prefix to the record update to form a set of self descriptive records. By sending a set of self descriptive records to a remote auxiliary site to form a consistency group with ordered record updates, record updates can be shadowed at a primary site in a sequence consistent with write updates causing write I / O operations.