Patent ID: 7849282
Filing Date: 2010-12-07
Classification: G06F

Abstract:
1. A file server coupled to a storage unit having a plurality of storage mediums including at least one first type storage medium and at least one second type storage medium of which access time is lower than access time of the at least one first type storage medium, the file server comprising: a network interface for communicating with a client computer; and a file manager for managing files stored in a plurality of logical units corresponding to a plurality of file systems, respectively, in the storage unit, wherein the file manager configures at least one file system of the plurality of file systems, in an integrated logical unit including both the at least one first type storage medium and the at least one second type storage medium, wherein the network interface receives a first write request of a first file of the file system related to the integrated logical unit from the client computer, the first file including first data and first metadata, the first metadata including a first file name and first inode information, wherein the file manager registers the first metadata of the first file to the at least one first type storage medium, and writes the first data of the first file to the at least one first type storage medium, which are selected based on a distribution rule to be set depending on a file value, wherein the network interface receives a second write request of a second file of the file system from the client computer, the second file including second data and second metadata, the second metadata including a second file name and second inode information, wherein the file manager registers the second metadata of the second file to the at least one first type storage medium, and writes the second data of the second file to the at least one second type storage medium, which are selected based on the distribution rule, wherein when a changed said file value of the first file in the integrated logical unit causes storage of the first file within the at least one first type storage medium to become conflicted with the distribution rule of the first file, the file manager moves the first data in the first file from the at least one first type storage medium to the at least one second type storage medium within a same said integrated logical unit, and modifies the first metadata already stored in the at least one first type storage medium, so as to point to a location of the actual data of the at least one second type storage medium.