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A method for managing information allocation by using a capacity of free memory area

IP.com Disclosure Number: IPCOM000236798D
Publication Date: 2014-May-16
Document File: 1 page(s) / 14K

Publishing Venue

The IP.com Prior Art Database

Abstract

A method for managing information allocation by using a capacity of free memory area.

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A method for managing information allocation by using a capacity of free memory area

A method for managing information allocation by using a capacity of free memory area

Disclosed is a method for managing information allocation by using a capacity of free memory area.

There is a method for using a tape medium (a tape cartridge or medium) via a file system as if the tape medium is a HDD or a USB memory. For example, a linear tape file system (LTFS) manages a tape medium split into two areas called a data partition (DP) and an index partition (IP). The LTFS stores the main body of a file in the DP of a tape medium and also stores metadata on the file, called an index, such as a file name or an ID for identifying the file, in the IP of the tape medium in an extensible markup language (XML) file format. The index includes metadata on all of files stored in a single tape medium. The size of the index is about 1 GB per 1 million files. Because it is hard to store all of data in index on memory, LTFS stores it in HDD normally and copy a part of the data on memory if needed. At sync operation, LTFS read all index data from HDD. If index size is large, the time to read index data from HDD is the bottle neck of sync operation.

The disclosure provide the method for changing allocating memory size for index data by free memory area to reduce the time of sync without any performance side effect for other applications. If index size is smaller than threshold which is defined...