Patent ID: 7401129

Claim:
A method comprising: holding, in a cache memory in a front-end server, at least one operation request directed from a client device to a NAS (Network Attached Storage) server, the client device and the NAS server being coupled via the front-end server; receiving, at a client operation processing unit in the front-end server, said at least one operation request from the client device; performing, in the client operation processing unit, an operation based on said at least one operation request by using cache data stored in the cache memory; creating, in a data change reflection processing unit in the front-end server, at least one operation sequence, the created at least one operation sequence being a result of an operation performed by the client operation processing unit in response to the received at least one operation request from the client device; and transmitting, by the data change reflection processing unit, the created at least one operation sequence to the NAS server; wherein, in response to a determination that multiple operation requests from the client device are compatible for merging the client operation processing unit synthesizes a plurality of the operation requests received from the client device into one combined operation request, and the client operation processing unit executes the combined operation request using the cache data in the front-end server to create the created at least one operation sequence.