Cache method for virtual storage devices

A virtual storage device and caching technology, which is applied in the field of caching technology, prefetching, and virtualization technology, can solve the problems of low hit rate and low hit rate, achieve high hit rate, good flexibility and adaptability, and increase flexibility and adaptive effects

Inactive Publication Date: 2010-06-30
BEIHANG UNIV
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  • Abstract
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Problems solved by technology

This caching mechanism through shared cache has certain disadvantages. On the one hand, when virtual storage device A instance and virtual storage device B instance are accessed at the same time, it may happen that the cache of virtual storage device A instance is just put into the shared cache, and it may be virtualized. The cache replacement of the storage device B instance, and then the virtual storage device A instance will replace the cache of t

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  • Cache method for virtual storage devices

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Embodiment Construction

[0020] The present invention will be further described in detail below in conjunction with the accompanying drawings.

[0021] Such as figure 2 As shown, the virtual machine system involved in the present invention includes the following components: a virtual machine monitor VMM1, a virtual storage device emulator 2, a virtual storage device instance pool 21, a mapper 22, a virtual storage device management module 23, and a cache management module 24 , a policy module 25 , an I / O subsystem 3 of the VMM, and a physical storage device 4 . Among them, the cache management module 24 and the policy module 25 are newly added modules of the present invention. The virtual storage device management module 23 creates corresponding virtual storage device instances according to the configuration files of the virtual storage devices of each virtual machine, and virtual machine A, virtual machine B, and virtual machine C access their own virtual storage devices through virtual storage dev...

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Abstract

The invention provides a cache method for virtual storage devices. A cache management module and a strategy module are added in the virtual storage device simulator of the traditional virtual machine monitor VMM. Firstly, when the virtual storage devices are created, the cache management module distributes respective independent cache for each virtual storage device; secondly, when the virtual storage devices are accessed, the strategy module appoints a prefetch strategy and a replacement strategy for the example of each virtual storage device and dynamically regulates the prefetch strategy. The cache method enables the hit rate of prefetched data to be increased, thereby further improving the access performance of the virtual storage devices.

Description

technical field [0001] A caching mechanism of a virtual storage device proposed by the present invention specifically relates to the fields of virtualization technology, caching technology and prefetch technology. Background technique [0002] Virtual machine technology has gradually become a research hotspot in the current industry and academia. The virtual machine monitor (VMM) implements hardware abstraction at the software layer, maps physical resources to multiple upper-layer guest operating systems, and virtualizes hardware resources. Realize running multiple operating systems at the same time and isolate them from each other. As one of the important hardware resources, the disk is bound to become the focus of attention when applying virtual technology to its storage field. The process of changing and converting the storage resources and storage management of the original storage entity by the new storage entity is called storage virtualization. Storage resources inclu...

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Application Information

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IPC IPC(8): G06F3/06G06F12/08G06F12/0877
Inventor 龙翔陈贤钦王素梅高小鹏张炯
Owner BEIHANG UNIV
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