Patent ID: 8539150
Filing Date: 2013-09-17
Classification: G06F

Abstract:
1. A storage system coupled to a host computer, comprising: a controller; a cache memory configured to cache a part of user data and a part of control information; and a plurality of storage devices providing a pool volume which is associated with a first virtual volume for storing the user data and a second virtual volume for storing the control information, the pool volume configuring a plurality of storage areas; wherein, in response to a write request from the host computer to the first virtual volume, the controller is configured to cache user data accompanied with the write request to the cache memory and allocate one or more of the storage areas to the first virtual volume to store the user data, and wherein, when updating first control information of the control information, the controller is configured to cache the first control information to the cache memory and allocate one or more of the storage areas to the second virtual volume to store the first control information.