Patent ID: 8230194
Filing Date: 2012-07-24
Classification: G06F,Y10S

Abstract:
1. A file storage system comprising: a first storage system, providing a first logical area as a first storage class, in which a plurality of first files of a first file system are stored in the first logical area; and a second storage system coupled to the first storage system, providing a second logical area as a second storage class, wherein at least one of the plurality of first files is migrated from the first logical area to the second logical area, based on a lifecycle set to the plurality of the first files of the first file system, wherein, in response to setting up the second logical area as a file migration destination of a file in the first logical area, the file storage system executes a process of creating a second file system for the file migration destination on the second logical area, if there is no file system for the file migration destination on the second logical area, and wherein if a used capacity of the first logical area exceeds a predetermined threshold, the first storage system migrates one or more first files, stored in the first logical area, from the first logical area to the second logical area regardless of the lifecycle set to the plurality of the first files, the one or more first files having an access frequency that is lower than that of other first files stored in the first logical area.