Patent attributes
In the present invention, when configuration data art a LFS (Log-Structured File system) is stored on a virtual volume constructed from a plurality of Storage mediums, a temporal change of the file size on the file system is roughly estimated. Then, in accordance with the change, a capacity that is needed on the virtual volume is provided, a cursor at the end of a log is set, and a write cursor for writing data is set so as to avoid the position behind the cursor at the end of the log. Accordingly, it is possible to, when the LFS occupies only a small area on the virtual volume, avoid early execution of the allocation of an available capacity, and thus avoid a circumstance in which a large number of storage mediums are needed at an early stage of the operation of the virtual volume (see FIG. 1).
