Patent ID: 8578206
Filing Date: 2013-11-05
Classification: G06F

Abstract:
1. A disk controller to control a plurality of disk devices to store redundant data distributed there across, the disk devices providing at least one logical volume across the disk devices, the disk devices including a plurality of pool volumes allocatable to one of the logical volumes in accordance with an access from a host to the logical volume, the disk controller comprising: a memory to store information indicating a relationship between the pool volumes and the logical volume, the information used to allocate the pool volumes to the logical volume when a real area of the pool volumes used for the logical volume is not previously allocated to a logical volume before a host makes a request; and a processor to perform data reconstruction in accordance with a failure of the disk devices, a process of the data reconstruction including reading data from a plurality of the pool volumes included in the other disk devices, the processor configured to execute: