Patent ID: 9015111
Filing Date: 2015-04-21
Classification: G06F

Abstract:
1. A storage system comprising at least three storage apparatuses, wherein each of the storage apparatuses includes a processor coupled through a communication line to at least one of different storage apparatuses, a cache memory coupled to the processor, and a storage device coupled to the processor, a processor of a first storage apparatus among the storage apparatuses is coupled to a host computer to supply a virtual volume to the host computer, and in a case where the processor of the first storage apparatus receives a write request from the host computer as a request for data access to the virtual volume and a cache memory of any of the storage apparatuses is not allocated to a virtual storage area in the virtual volume designated by the data access request, the processor of the first storage apparatus selects a second storage apparatus and a third storage apparatus among candidates satisfying a predetermined state condition among the storage apparatuses based on connection information indicating connection between the storage apparatuses through the communication line in order to write write data designated by the data access request in a cache memory of the second storage apparatus among the storage apparatuses and to write the write data, which is written in the cache memory of the second storage apparatus, in a storage device of the third storage apparatus of the storage apparatuses.