Patent ID: 7809884
Filing Date: 2010-10-05
Classification: G06F,Y02D

Abstract:
1. In a data storage system, a method of providing access to data, the method comprising: providing a disk mirroring assembly including a primary mirror and a secondary mirror, the primary mirror having a set of high speed disk drives, each high speed disk drive being configured to provide data access while rotating platters at a predefined high performance speed, the secondary mirror having a set of moderate speed disk drives, each moderate speed disk drive being configured to provide data access while rotating platters at a predefined moderate speed which is less than the predefined high performance speed; operating the disk mirroring assembly in a particular power management state; and performing data access operations on the disk mirroring assembly while the disk mirroring assembly operates in the particular power management state; wherein the predefined high performance speed is a maximum operating speed at which each high speed disk drive is configured to read and write data; wherein the predefined moderate performance speed is a maximum operating speed at which each moderate speed disk drive is configured to read and write data; wherein the disk mirroring assembly is configured to operate within a variety of power management states over time including: wherein operating the disk mirroring assembly in the particular power management state includes: wherein performing data access operations on the disk mirroring assembly includes: