Patent ID: 9110909
Filing Date: 2015-08-18
Classification: G06F

Abstract:
1. A computer system comprising, a storage system for providing a first storage region and a second storage region; and a file service system coupled to a client computer and the storage system; wherein the performance of the first storage region is higher than that of the second storage region; wherein the file service system manages accessed file information including a plurality of partial accessed file lists, in which the files in each of the partial accessed file lists have been created within a period of time specified for the corresponding partial accessed file list, and stores files, each including file meta-information and file data in the first storage region; wherein each of the file meta-information indicates a file creation time, a last accessed time and a last updated time of the relevant file data; wherein the file service system selects at least one of the partial accessed file lists that satisfies a migration policy information, and selects a candidate file to be migrated from the first storage region to the second storage region from files indicated in the selected at least one partial accessed file list based on the last accessed times or the file creation time indicated by the file meta-information; and wherein the file which is not selected as the candidate file is re-registered to the partial accessed file list which corresponds to a period of time including the last accessed time or the last updated time of the file.