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Packet-based disk array cache optimization technology research and implementation

Author: ZhangMengLong
Tutor: ChenJianXi
School: Huazhong University of Science and Technology
Course: Computer System Architecture
Keywords: Cache optimization Spatial locality Packet buffer
CLC: TP333
Type: Master's thesis
Year: 2011
Downloads: 15
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Abstract


With the rapid development of information science and technology , people have growing demand for mass information storage , CPU processing speed and storage I / O processing speed of the growing gap between the disk I / O an impact on the performance of the computer system major factor. To compensate for the great differences between the processing speed of the disk array system is added to cache Cache and manage data , to minimize the cost of disk read and write to shorten the I / O request response time , thus improving the storage system I / O performance. How to properly organize and manage Cache, to maximize its effectiveness , making the rapid and efficient operation of the entire system , the storage industry has been a hot research topic . Enhance Cache Cache performance is critical to improve the hit rate and reduce page I / O time . And reasonable Cache organization and scheduling strategy is to improve search efficiency and critical hit rate . Designed to use a base tree (Radix Tree) Cache, can achieve fast positioning, shorten the search time ; and the least recently used scheduling algorithm based on the use of spatial locality , will address the adjacent Cache dynamic grouping , improved Cache replacement policy , the use of prefetch optimization strategies , write-back strategy to improve Cache hit rate and reduce IO time, improve data read and write speeds. Cache Cache grouping idea is for the operations are implemented in the group , when there is data access hit , according to the principle of local space , grouping blocks and hit the other Cache Cache block address close may be accessed in the future , so the whole group within All mentioned front of the queue in Cache . This can improve the Cache hit rate, on the other hand can be maintained Cache address continuity , Cache write back when grouped as a unit, a continuous written back to disk when physical seek to effectively reduce the head and rotation time , thus reducing the IO time . For multi-user access to data while data caused randomness search can be effectively separated by the packet of the sequence of each user to access data . Test results show that the system can effectively improve the optimization grouping Cache Cache hit rate and IO access speed.

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CLC: > Industrial Technology > Automation technology,computer technology > Computing technology,computer technology > Electronic digital computer (not a continuous role in computer ) > Memory
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