本文關(guān)鍵詞：虛擬化環(huán)境下的虛擬磁盤(pán)寫(xiě)緩存機(jī)制研究　出處：《華中科技大學(xué)》2013年碩士論文　論文類(lèi)型：學(xué)位論文

  更多相關(guān)文章： 虛擬化 磁盤(pán)寫(xiě)緩存 讀寫(xiě)性能 可靠性

【摘要】：在虛擬化環(huán)境下，對(duì)于一些具有高可靠性需求的虛擬機(jī)，為了保證用戶數(shù)據(jù)的一致性會(huì)采用寫(xiě)直達(dá)的磁盤(pán)寫(xiě)緩存策略；對(duì)于其他具有I/O性能需求的虛擬機(jī)，采用寫(xiě)回策略的磁盤(pán)寫(xiě)緩存可以確保其基本的I/O性能。在同一個(gè)虛擬化平臺(tái)下，具有不同性能需求的虛擬機(jī)共享底層磁盤(pán)寫(xiě)緩存，因此，它們?cè)趯?xiě)緩存的使用方式上存有爭(zhēng)議。但是，在當(dāng)前的虛擬化環(huán)境下，針對(duì)不同性能需求的虛擬機(jī)對(duì)磁盤(pán)寫(xiě)緩存使用方式上的矛盾并沒(méi)有相應(yīng)的解決方案。 虛擬化環(huán)境下的虛擬磁盤(pán)寫(xiě)緩存系統(tǒng)(VDWB)利用計(jì)算機(jī)系統(tǒng)虛擬化的結(jié)構(gòu)特點(diǎn)，實(shí)現(xiàn)了在同一個(gè)虛擬化平臺(tái)上可靠性虛擬機(jī)和I/O性能型虛擬機(jī)在使用磁盤(pán)寫(xiě)緩存上的良好共存。VDWB系統(tǒng)首先對(duì)底層磁盤(pán)寫(xiě)緩存采用寫(xiě)直達(dá)方式，保證了上層可靠性虛擬機(jī)的數(shù)據(jù)一致性要求，然后為I/O性能型虛擬機(jī)在VMM中開(kāi)辟一片內(nèi)存空間作為虛擬磁盤(pán)寫(xiě)緩存(VDiskCache)，，通過(guò)虛擬磁盤(pán)寫(xiě)緩存對(duì)寫(xiě)數(shù)據(jù)流的緩沖作用，彌補(bǔ)因底層磁盤(pán)寫(xiě)緩存采用寫(xiě)直達(dá)方式而造成的I/O性能損失。虛擬機(jī)對(duì)虛擬磁盤(pán)寫(xiě)緩存的內(nèi)部可控性，使得虛擬機(jī)根據(jù)上層應(yīng)用需求的改變，可以實(shí)時(shí)的打開(kāi)或關(guān)閉其相應(yīng)的虛擬磁盤(pán)寫(xiě)緩存，來(lái)適應(yīng)虛擬機(jī)在可靠性或I/O性能間的需求變化。同時(shí)設(shè)計(jì)了虛擬磁盤(pán)寫(xiě)緩存帶寬控制算法，減小頻繁的虛擬磁盤(pán)寫(xiě)緩存刷新對(duì)可靠性虛擬機(jī)的性能影響。 實(shí)驗(yàn)結(jié)果表明，VDWB系統(tǒng)解決了對(duì)底層磁盤(pán)寫(xiě)緩存的使用方式上，可靠性虛擬機(jī)需要采用寫(xiě)直達(dá)方式，而I/O性能型虛擬機(jī)需要采用寫(xiě)回方式的爭(zhēng)議問(wèn)題。在確�？煽啃蕴摂M機(jī)的數(shù)據(jù)一致性的前提下，VDWB系統(tǒng)保證了I/O性能型虛擬機(jī)的I/O性能，使其系統(tǒng)吞吐量提升了100%。
[Abstract]:In the virtualization environment, for some virtual machines with high reliability, in order to ensure the consistency of user data, write-to-write cache policy will be adopted. For other virtual machines with I / O performance requirements, disk write caching using write-back policies ensures basic I / O performance on the same virtualization platform. Virtual machines with different performance requirements share the underlying disk write cache, so their use of write cache is controversial. However, in the current virtualization environment. There is no solution to the problem of disk write cache usage for virtual machines with different performance requirements. Virtual disk write caching system (VDWB) in virtualized environment takes advantage of the structural characteristics of computer system virtualization. Implemented on the same virtualization platform reliability virtual machine and I / O performance virtual machine in using disk write cache good coexistence .VDWB system first of all the underlying disk write cache using write direct mode. The data consistency requirement of the upper reliability virtual machine is guaranteed, and then a memory space is opened up in VMM for the I / O performance virtual machine to write cache VDiskCache. Through the buffering effect of virtual disk write cache on write data stream, I / O performance loss caused by the underlying disk write cache using write direct mode is compensated, and the internal controllability of virtual disk write cache caused by virtual machine. The virtual machine can open or close the corresponding virtual disk write cache in real time according to the change of the upper application requirements. In order to adapt to the requirements of virtual machine between reliability and I / O performance, a virtual disk write buffer bandwidth control algorithm is designed to reduce the impact of frequent virtual disk write cache refresh on the reliability of virtual machine. The experimental results show that the VDWB system solves the use of the underlying disk write cache, and the reliability virtual machine needs to use write direct mode. However, I / O performance virtual machine needs to be written back. VDWB system ensures I / O performance of I / O performance virtual machine on the premise of data consistency of reliable virtual machine. Increases its system throughput by 100.
【學(xué)位授予單位】：華中科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2013
【分類(lèi)號(hào)】：TP333.35

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