Patent ID: 7971097
Filing Date: 2011-06-28
Classification: G06F,Y10S

Abstract:
1. A storage system coupled to a computer comprising: a plurality of physical storages configuring a first logical storage and a second logical storage; a control unit receiving a read request and a write request from the computer; and a cache memory temporarily storing read data to be sent to the computer according to the read request, wherein, if the control unit receives the write request for the first logical storage, the control unit records write data corresponding to the write request to the cache memory, and notifies of a termination of the write request to the computer, wherein, after notifying of the termination of the write request to the computer, the control unit reads object data which is an object of the write request from a first part of the plurality of physical storages corresponding to the first logical storage, records the object data to the cache memory, and creates a journal data based on the write data and the object data in the cache memory, wherein, asynchronously to the creation of the journal data in the cache memory, the control unit records the journal data to a second part of the plurality of physical storages corresponding to the second logical storage, and wherein, if the write request is not for the first logical storage, the control unit records the write data corresponding to the write request to the cache memory, records the write data to at least one of the plurality of physical storages and notifies of a termination of the write request to the computer.