Fast synchronous and high performance journal device and synchronous writing operation method

A high-performance, write-operating technology, used in instruments, electrical digital data processing, memory systems, etc., and can solve problems such as high prices

Inactive Publication Date: 2005-01-12
TSINGHUA UNIV
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Problems solved by technology

However, the price of NVRAM is very expensive, generally 4 to 10 times the price of DRAM; at the same time, special software support is required

Method used

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  • Fast synchronous and high performance journal device and synchronous writing operation method
  • Fast synchronous and high performance journal device and synchronous writing operation method
  • Fast synchronous and high performance journal device and synchronous writing operation method

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Embodiment Construction

[0047] The invention adds a layer of cache disk between the traditional two-layer storage structure of memory and disk to form a three-layer storage structure of memory, cache disk and data disk. structured as figure 1shown. Generally, the data transfer between memory and data disk can be divided into write operation and read operation. The write operation is generally divided into synchronous operation and asynchronous operation. For asynchronous operations, since the process does not need to wait for the execution result of the storage system, it will not have a significant impact on the performance of the system; for synchronous operations, the process needs to wait for the data disk to complete, due to the huge difference between disk performance and memory performance, synchronization Operations can greatly affect the performance of the system.

[0048] The cache disk in the fast synchronous high-performance log device structure is specially optimized for synchronous w...

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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.

Description

technical field [0001] A fast synchronous high-performance log device and a synchronous write operation method thereof belong to the field of computer storage system structures. Background technique [0002] The main performance bottleneck of today's computer systems is the I / O link. This is mainly due to the fact that the improvement in I / O system performance is much lower than the improvement in CPU and memory performance. According to Moore's law, CPU performance and memory capacity can double every 18 months. However, as the main device of external storage - hard disk, due to the essential characteristics of mechanical movement, the performance improvement is very limited, about 7% per year. This can be derived from Amadl's law, and now the performance of I / O plays a decisive role in the overall performance of the system. However, it should be pointed out that the disk storage density increases by about 100% every year, which is even higher than the increase rate of C...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F12/0866
Inventor 郑纬民张悠慧靳超周枫
Owner TSINGHUA UNIV
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