Method for rewriting in magnetic disc array structure

A disk array and disk technology, applied in instruments, electrical digital data processing, memory systems, etc., can solve problems such as low write-back efficiency, reduce positioning time, optimize system performance, and improve write-back efficiency.

Active Publication Date: 2009-03-18
HUAWEI TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0046] The technical problem to be solved by the present invention is: to overcome the deficiency of low write-back efficiency in the existing disk array structure with Cache, and provide a method for writing back in the disk array structure, thereby improving the write-back efficiency of Cache and optimizing the storage system performance

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  • Method for rewriting in magnetic disc array structure
  • Method for rewriting in magnetic disc array structure
  • Method for rewriting in magnetic disc array structure

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Embodiment Construction

[0083] Below according to accompanying drawing and embodiment the present invention will be described in further detail:

[0084] The invention aims at improving the write-back efficiency of Cache in the storage system, and optimizes the whole flow of write-back at the system level. Starting from the source Cache for write-back optimization, after going through the RAID processing module and the disk channel processing module, a set of processes is specially provided for write-back to improve efficiency.

[0085]First, in the Cache, select one area for writing back each time, and ensure that only one area in a RAID group is writing back at the same time, so as to ensure that the movement of each disk head is fixed in one area during this period of time, effectively Reduce the positioning time of the magnetic head in writing back, thereby greatly improving the efficiency of disk reading and writing.

[0086] Help RAID shield the concept of BLOCK in Cache. Since the minimum un...

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Abstract

The write-back method in disc array structure includes for the cache to select area to be written back in certain policy, to pre-treat data in the area, to batch issue the magnetic disc sub-read requests, to process returned sub-read request response, to batch issue the magnetic disc sub-write requests, and to process returned sub-write request response. The selection of the cache on the write-back area ensures the write-back of the data with highest need, creates cache space at most after completing write-back, and moves the write-back head in one fixed area to reduce the write-back head locating time. The cache has item unit as the minimum unit provided to RAID, and all the read and write requests to all the items are issued concentratively in magnetic disc, so that the read and write requests to the magnetic discs may be merged and dispatched effectively to raise the write-back efficiency.

Description

technical field [0001] The invention relates to data storage, in particular to a method for writing back in a disk array structure. Background technique [0002] With the continuous expansion of computer application fields, users have higher and higher requirements for storage system capacity, reliability and availability, and faster speed. The processing speed of the microprocessor is correspondingly increased rapidly. However, due to the limitation of mechanical movement, the speed of the disk as the main external memory is not improved much (the access time stays at the millisecond level), which greatly limits the overall performance of the SAN (Storage Area Network) system. The disk array structure (RAID) with Cache (high-speed cache) that solves this bottleneck occupies a dominant position in high-performance computer storage with its advantages of high efficiency, fast, large capacity, high reliability, flexibility and low price. [0003] Disk array technology forms ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F12/08G06F12/0868
Inventor 陈绍元黄玉环唐小松张粤张国彬张巍任雷鸣
Owner HUAWEI TECH CO LTD
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