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Storage-class memory based method for improving performance of log file system

A storage-level memory and log file technology, applied in the field of computer data storage, can solve the problems of reduced file system performance and poor random small-write performance of the disk, and achieve the effects of simplifying the log mode, improving write performance, and speeding up recovery

Active Publication Date: 2016-02-17
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

Although the metadata are all small updates, the disk random small write performance is very poor
Therefore, frequent access to metadata and a large number of small write operations will greatly reduce the performance of the file system

Method used

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Embodiment Construction

[0024] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not constitute a conflict with each other.

[0025] figure 1 A schematic diagram of the system construction of the present invention. In terms of hardware deployment, it is necessary to mount an SCM disk on the memory bus as a log disk and metadata disk, and share the memory bus with DRAM; the software structure includes four operations: write log operation, garbage collection operation, data write-back operation, and system recovery oper...

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Abstract

The invention discloses an SCM (storage-class memory) based method for improving the performance of a log file system. An SCM serves as a memory device for storing metadata and logs of the file system, so that the reading and writing of the metadata are optimized; coverage writing and additional writing are distinguished, only coverage writing data are written in the logs, additional writing data are directly written in the file system, and an update sequence is controlled to ensure the consistency of the file system, reduce the log overhead, and improve the performance of the file system; and the characteristic of modification by byte for the SCM is utilized, and the difference between new and old log blocks is computed, so that the update of log byte granularity is realized, and log data streams are reduced. The method mainly comprises five operations of storage system construction, log writing, garbage collection, data back-writing and system recovery, can be used for various log file systems, is suitable for constructing high-performance, high-capacity and high-reliability large-sized storage systems, and solves the problems of high extra overhead, high metadata back-writing frequency, low recovery speed after downtime and the like of a log technology in an existing log file system.

Description

technical field [0001] The invention belongs to the technical field of computer data storage, and more specifically relates to a method for improving the performance of a log file system based on storage-level memory. Background technique [0002] Storage Class Memory (SCM for short) is a new type of non-volatile memory that has the characteristics of both memory and storage. The byte addressing and fast random access characteristics of SCM are close to that of memory, so SCM can be directly mounted on the memory bus, which is beyond the reach of traditional storage devices. It is based on these excellent performances that the emergence of SCM can not only solve the I / O bottleneck and energy consumption problems of high-performance data centers, but also lead to changes in the structure of computer systems. Therefore, SCM is not only a hotspot in the current storage field research, but also will be the core of storage field research for a long time in the future. [0003] ...

Claims

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Application Information

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IPC IPC(8): G06F3/06G06F17/30
CPCG06F3/0652G06F16/1815
Inventor 曾令仿涂盛霞张晓祎冯丹
Owner HUAZHONG UNIV OF SCI & TECH
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