Cache read-write operation method and system for flashcache hybrid storage system

Abstract

The invention provides a cache read-write operation method for a flashcache hybrid storage system. A read-write lock is arranged in a metadata structure corresponding to each cache block in a cache. The method comprises the steps that whether an operation request is read operation or write operation is judged; if the operation request is read operation, the metadata structure corresponding to the cache block which the operation request points to is asked for a reader lock, read operation is performed, and write operation on the corresponding cache block is rejected when the reader lock is in a locked state; and if the operation request is write operation, the metadata structure corresponding to the cache block which the operation request points to is asked for a writer lock, write operation is performed, and read operation and other write operation on the corresponding cache block are rejected when the writer lock is in a locked state. Through the method, parallel operation on the cache is realized, and the read-write efficiency of the cache is improved.

Description

technical field [0001] The invention relates to the field of storage systems, in particular to a cache read and write operation method and system of a flashcache hybrid storage system. Background technique [0002] With the rapid development of the Internet industry and the rise of technologies such as cloud computing and big data, the processing speed of the storage system has become more and more important. Mechanical hard disk (Hard Disk Drive, HDD) is the main way of large-capacity storage at present. Its capacity can be continuously increased, but the processing speed is difficult to increase, which has become an important factor restricting the speed of the storage system. Solid State Drives (SSD) are made of solid state electronic memory chip arrays, which are very suitable for handling a large number of read and write accesses, but they are expensive and have a limited lifespan. Therefore, based on the two storage media of mechanical hard drives and solid state drive...

AI Technical Summary

Problems solved by technology

[0004] In the flashcache hybrid storage system, in the cache read and write operation method, after receiving the read and write operation request from the upper layer, the spin lock operation is performed first, and the corresponding operation can only be performed after the operable access value is returned. Read and write operations, the spin lock is shared by the entire cache, so that only one read and write operation request can perform operations on the cache at a time, which is equivalent to the serialization operation of the cache, and the read and write efficiency of the cache is low

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