Patent ID: 8850117

Claim:
A distributed-cache-memory storage system in which an order of writing data in a remote copying in an asynchronous mode is preserved, the distributed-cache-memory storage system comprising: a plurality of storage devices connected together over a network, the plurality of storage devices including a copy-source storage device being a copy source having data to be copied and one or more copy-target storage devices being a copy target capable of receiving at least part of the data to be copied, and wherein the copy-source storage device includes a copy-source controller for checking parameters contained in a buffer newly setting command to determine a group of storage devices, including the copy-source storage device, to be subjected to a newly setting of a buffer and a specified copy-target storage device in the group and transmitting the parameters to the specified copy-target storage device, wherein the buffer newly setting command is collectively distributed, upon execution of a buffer newly setting process in the copy-source storage device, to the specified copy-target storage device based on a grouping associated with the parameters received in the buffer newly setting command and notifying the copy-source storage device of a result of the buffer newly setting process, wherein the parameters include identification of a number of groups of storage devices, which include the copy-source storage device, to be collectively subjected to the buffer newly setting command, a device identifier identifying each of the copy-target storage devices, a buffer size, and a buffer usage indicating that a storage device identified by the device identifier is the copy source or the copy target, and wherein the copy-source storage device performs the buffer newly setting process on a plurality of groups in a collective manner.