System and method for moving and techniques storage tiering based on quality of service

摘要

PROBLEM TO BE SOLVED: To perform data management with high performance in a data storage system.;SOLUTION: The Qos factor measurement value of an application process is determined and compared with first and second QoS factor thresholds when the application process accesses a first storage tier of the storage system (402, 404, 406). When the measurement value is larger than the first threshold, a PiT copy is created based upon the first storage tier, an access permission of the PiT copy is established as Read Only (408), when the measurement value is present between the first and second thresholds, data are migrated from the PiT copy to a second storage tier, and after the migration of data is completed, the establishment of the access permission of the second storage tier is set as Read and Write, and I/O commands are directed to the second storage tier (412, 412). When the QoS factor measurement value is smaller than the first and second thresholds, second storage tier data are mirrored to the first storage tier (414), when mirroring is synchronized, read commands are directed to the second storage tier, and write commands are synchronized between the first storage tier and the second storage tier (416, 418).;COPYRIGHT: (C)2011,JPO&INPIT