Patent ID: 8201018
Filing Date: 2012-06-12
Classification: G06F

Abstract:
1. A method, comprising: sparing data to reconstruct a copy of the data after a disk failure in a storage system; inputting, to a controller and while continuing to spare the data, a first parameter that includes a response time to perform an input/output (I/O) request from an application to a disk in a disk array of the storage system; inputting, to the controller and while continuing to spare the data, a second parameter that includes an amount of data spared to the disk; and controlling, while continuing to spare the data and using the first and second parameters, both executing I/O requests from the application to the disk and a rate of sparing the data to the disk to reconstruct the copy of the data after the disk failure in the storage system, wherein the sparing to the disk continues when the application has I/O requests pending to the disk, and the controller uses the first and second parameters to determine when to continue to spare the data and when to discontinue to spare the data.