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Research on Journal File System for Object-Based Storage

Author: DiChao
Tutor: LuPing
School: Huazhong University of Science and Technology
Course: Computer System Architecture
Keywords: Object-based storage Object-Based Storage Device Journaling file system B-tree
CLC: TP316
Type: Master's thesis
Year: 2007
Downloads: 177
Quote: 2
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Abstract


File system is a modern operating system is an important component. For a file system , the most important is access speed , I / O efficiency and reliability. As the common Linux file system , Ext2 giant in handling large files and directory structure has some limitations , but also in computer hardware and software may be because of power failure or the failure occurred after the collapse need to scan the entire disk partition to restore the system consistent sex . The reason is by its basic organizational structure of the decision . Ext2 is designed for small and medium files , using traditional linear tables and multi-pole pointer index static organizational data , the lack of a mechanism for the recovery process can be shortened . Change the file system from the basic layout of the structure, the design and implementation of a contiguous block of B-tree -based journaled file system (Object-Based Journal File System, OSJFS), from several aspects of the performance of the file system extensions: Firstly, B-tree to organize large data files , disk free blocks and directory entries . Using B-tree index structure , can significantly improve large file and directory access to the object speed and expanded file system address space ; contiguous block allocation policy instead of using traditional block allocation strategy , reducing the allocation of I / O times and external debris to ensure that the file data is stored continuously try to improve the efficiency of sequential access files . Secondly, in the analysis of the current mainstream of the log file system and its own characteristics , combined with object storage , selected as the reference model introduced in Ext3 journaling technology ; For small files , keeping Ext2 file system while handling the file data directly embedded in inode node , the increase in the small file I / O performance and reduced internal fragmentation . Finally use the test tool OSJFS be tested and the results are analyzed and evaluated.

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CLC: > Industrial Technology > Automation technology,computer technology > Computing technology,computer technology > Computer software > Operating system
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