BACKUP STORAGE SYSTEM, BACKUP SYSTEM, DATA BACKUP METHOD AND RECOVERY METHOD

摘要

A backup storage system, a backup system, a data backup method and a recovery method are provided. The backup storage system comprises N storage subsystems, wherein an i(th) storage subsystem is connected with an i+1(th) storage subsystem, the performance of the i(th) storage subsystem is superior to that of the i+1(th) storage subsystem, the capacity of the i(th) storage subsystem is less than that of the i+1(th) storage subsystem, the cost of the unit capacity of the i(th) storage subsystem is higher than that of the i+1(th) storage subsystem, wherein the N is not less than 2, and the i is not less than 1 and not more than N-1. The technical solution can effectively improve the performance of the system without increasing the total cost of the system significantly, thereby improving the cost performance of the system.