Fast synchronous and high performance journal device and synchronous writing operation method |
Title： |
| Fast synchronous and high performance journal device and synchronous writing operation method |
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Application Number： |
200410003464 |
Application Date： |
2004/03/26 |
Announcement Date： |
2005/01/12 |
Pub. Date： |
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Publication Number： |
1564138 |
Announcement Number： |
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Grant Date： |
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Granted Pub. Date： |
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ApplicationType： |
Invention |
State/Country： |
11[China|beijing] |
IPC： |
G06F 12/08 |
Applicant(s)： |
Tsinghua Univ. |
Inventor(s)： |
Zheng Weimin, Zhang Youhui, Jin Chao |
Key Words： |
Fast synchronous, high performance, journal device, synchronous writing, operation method |
Abstract： |
Using high performance journal magnetic disk in small capacity as disk buffer raises disk synchronous writing operation in three-layered storage structure-memory, journal disk and data disk. When operating system executes synchronous writing operation, the method converts it to synchronous writing operation of journal disk and asynchronous writing operation of system buffer. Correspondingly, synchronous writing operation is raised. Features are: overhead of rotational delay is eliminated basically by predicting position of magnetic head so that command of writing operation is executed near place right ahead moving magnetic head. The method parks magnetic head at free magnetic track in advance; thus, in most cases, overhead of seeking track is also eliminated. Journal disk is through SCSI so as to improve performance of writing operation. |
Claim： |
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Priority： |
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PCT： |
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LegalStatus： |
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