Patent ID: 8019726
Filing Date: 2011-09-13
Classification: G06F

Abstract:
1. A file migration method of an information system including a first Network Attached Storage system, a second Network Attached Storage system, and a computer for reading and writing a plurality of files stored in the first Network Attached Storage system, wherein the file migration method of the information system includes file migration processing, and file migration termination processing to be executed after the execution of the file migration processing; wherein the file migration processing comprises: a step of acquiring and storing first attribute information including file names, update time information and a Write Only Read Many setting concerning a plurality of files stored in a designated directory of the first Network Attached Storage system; a step of acquiring and storing second attribute information including file names and update time information concerning a plurality of files stored in the second Network Attached Storage system; a step of identifying a file to be copied from the first Network Attached Storage system to the second Network Attached Storage system based on the difference between the stored first attribute information and second attribute information, and a prescribed rule which preferentially identifies a file with old update time information of the first attribute information as a file to be copied; a step of determining whether the identified file is set Write Only Read Many or not; and a step of copying the identified file from the first Network Attached Storage system to the second Network Attached Storage system in case that the identified file is not set Write Only Read Many; and wherein the file migration termination processing comprises: a step of acquiring and storing third attribute information including file names and update time information concerning a plurality of files to be stored in a designated directory of the first Network Attached Storage system; a step of acquiring and storing fourth attribute information including file names and update time information concerning a plurality of files stored in the second Network Attached Storage system based on the file migration processing; and a step of identifying and copying a file to be copied from the first Network Attached Storage system to the second Network Attached Storage system based on the difference between the stored third attribute information and fourth attribute information.