Patent ID: 8024525
Filing Date: 2011-09-20
Classification: G06F

Abstract:
1. A method for reducing bandwidth requirements in a storage system including backing storage and which is used by a client computer system, comprising: providing a storage control unit connected to the client computer system and the backing storage, and the storage control unit being configured to receive write requests to transfer WRITE DATA received from the client computer to the backing storage using block level addressing protocol; providing a journal memory storage device logically and/or physically external to the storage control unit; providing data structures within a memory of the storage control unit configuring the storage control unit to determine a next journal address and space available in the journal memory storage device for a journal entry and WRITE DATA to be written; receiving in the storage control unit, from the client computer system, a write request to the storage control unit to store WRITE DATA, and in response thereto operating the storage control unit to perform the following journaling and data operations: