Patent ID: 8612681
Filing Date: 2013-12-17
Classification: G06F

Abstract:
1. A storage system comprising: a first storage apparatus communicatively coupled to an external apparatus and including a cache memory; and a second storage apparatus communicatively coupled to the first storage apparatus and performs I/O processing on a storage device, wherein the first storage apparatus, when receiving a first write request that is a write request sent from the external apparatus, stores write data for the received first write request to the cache memory, returns a response to the external apparatus upon completion of the storing, and destages the write data at a timing asynchronous with the response by sending the second storage apparatus a second write request that is a write request for the write data, the second storage apparatus stores the write data into the storage device upon receipt of the second write request from the first storage apparatus, the second storage apparatus sends the first storage apparatus a forced destage request that is a request instructing the destage of the write data stored in the cache memory, before executing a predetermined storage function control processing, the first storage apparatus, when receiving the forced destage request, performs forced destage of destaging the write data from the cache memory in response to the request, and, upon completion of the forced destage, sends a notification of the completion to the second storage apparatus, and the second storage apparatus executes the storage function control processing after receiving the notification from the first storage apparatus.