Patent ID: 8423825
Filing Date: 2013-04-16
Classification: G06F,Y10S

Abstract:
1. A storage system coupled to a computer comprising: a plurality of physical storages being used to configure 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 storing data which is sent to the computer, wherein the control unit is configured to store a write data in the cache memory based on a write request and create a journal data in the cache memory, based on the write data and an object which is an object of the write request, by reading the object data from a first part of the plurality of physical storages corresponding to the first logical storage and storing the object data in the cache memory, wherein the control unit is configured to determine whether a request from the computer is a write request or a read request, wherein if the request is the read request, the control unit reads data from the cache memory or at least one of the plurality of physical storages based on the read request, wherein if the request is the write request, the control unit determines whether a destination of the write request is the first logical storage, wherein if the destination of the write request is not the first logical storage, the control unit reserves a part of the cache memory and stores write data in the part of the cache memory based on the write request without creating a journal data in the cache memory, and wherein if the destination of the write request is the first logical storage, the control unit stores write data in the cache memory based on the write request, and creates a journal data in the cache memory.