ASYNCHRONOUS TAPE BACKUP AND RESTORE FROM TAPE BACKUP IN A DISK STORAGE ENVIRONMENT

摘要

A first metadata object identifying a set of disk locations which have been written to since a previous consistency group is maintained. Backup data for the consistency group is written. Writing backup data for the consistency group includes identifying a disk location from the set of disk locations, generating a record containing the disk location, data stored at the disk location, and a consistency group value identifying the consistency group, writing the record to a record location in tape storage, and modifying a second metadata object to indicate that the record location contains the record. Records written to tape storage can be used to restore data to disk storage for a given consistency group.