Abstract:
A system, apparatus, and method to recover a logical volume on a physical volume, or data storage cartridge, within a dual copy data storage system, such as a virtual tape server (VTS) system. Such recovery follows a disaster situation involving a primary copy of the requested logical volume. The system, apparatus, and method include modules and steps as required to recover a logical volume, or data file or block, through manipulation and swapping of record files, or stubs, that point to primary and secondary copies of a logical volume. Such primary and secondary logical volumes are stored on distinct physical volumes in order to provide quality storage media management and reduce the likelihood of loss of data. The recovery and swapping procedures are implemented in a manner that is substantially transparent to a host or client requires no additional input from the host or client