| 摘要 |
Described is a computerized system for continuous data protection. The system includes a host executing a user application and a storage subsystem coupled to the host via a network interconnect. The storage subsystem comprises a storage controller and a storage disc coupled to the storage controller. The storage disc is apportioned into logical partitions. The storage subsystem additionally includes a primary volume storing current data associated with the user application; a base volume storing a point-in-time copy of the data associated with the user application; a journal volume storing data associated with the user application; and a journal manager configured to intercept a data write request sent by the host to the storage subsystem and to write data associated with the intercepted request to the primary volume and the base volume and to write the second data associated with the user application into the journal volume. Using the described technology, an application, like an RDBMS (DB), can control storage subsystem based on application specified marker operation. As one of examples, DBMS keeps roll back data records on a storage medium, even if the application executes in the online backup mode which prescribes keeping only roll forward information on the pending transactions. |
