Cache management method of single-carrier multi-target cache system

Abstract

The invention provides a cache management method of a single-carrier multi-target cache system. The cache management method comprises the following steps: requesting for allocating a new cache block to store data when a read-write operation of a user is missed in a corresponding cache device; directly allocating if an idle buffer block exists in an available cache address space; executing the operation for adding 1 to the insufficiency frequency of the cache block if no idle buffer block exists; judging whether the frequency is more than a preset threshold, and returning to execute cache replacement operation if the frequency is not more than the preset threshold; checking information of the cache block of other disks if the frequency is more than the preset threshold; returning to execute the cache replacement operation if other disks have no idle cache block; writing all the cache data back into respective hard disks; and reallocating the space of the cache block according to the service condition. In the invention, an independent cache space is allocated to each disk, then set-associative mapping is respectively carried out on each disk, and the cache device can be automatically reallocated when the system detects that a certain disk requires more or less cache space, thus the whole system can obtain better IO (input output) performance.

Description

technical field [0001] The invention relates to the field of storage system cache management, in particular to a method for dynamically adjusting the sharing ratio of multiple target disks sharing a single cache device to ensure balanced performance improvement. Background technique [0002] The disk has always occupied a place in the computer system with its advantages of large capacity and low price, but its internal mechanical components limit the further improvement of the speed, especially for discontinuous IO data access, the performance is far behind The development of memory. Therefore, the disk access speed has always been the bottleneck of IO-intensive applications. In order to improve the read and write performance of the disk, disk manufacturers have added a cache (Cache memory) inside the disk. Cache is a memory chip on the hard disk controller with extremely fast access speed. It is the interface between the internal storage of the hard disk and the external i...

AI Technical Summary

Problems solved by technology

[0008] In order to solve the waste of a large amount of cache space caused by the different frequency of disk use, the present invention provides a cache management method for a single-carrier multi-object cache system

Images