本文選題：虛擬機(jī)　切入點(diǎn)：塊設(shè)備　出處：《華中科技大學(xué)》2012年碩士論文

【摘要】：服務(wù)器是信息服務(wù)業(yè)的基礎(chǔ)設(shè)施，但當(dāng)前利用率普遍偏低。虛擬化技術(shù)能夠提升服務(wù)器效率，，降低管理復(fù)雜程度，在數(shù)據(jù)中心得到廣泛運(yùn)用。塊設(shè)備是存儲(chǔ)I/O系統(tǒng)中的主要外部設(shè)備，其訪問性能對(duì)系統(tǒng)整體運(yùn)行效率產(chǎn)生重要影響。虛擬化環(huán)境中存在大量并發(fā)訪問，使塊設(shè)備負(fù)擔(dān)加劇，成為制約整體性能的瓶頸。 為解決虛擬機(jī)塊設(shè)備的訪問瓶頸問題，以Linux操作系統(tǒng)中開源虛擬機(jī)軟件Xen為對(duì)象，研究虛擬機(jī)塊設(shè)備訪問方式的優(yōu)化方案。分析發(fā)現(xiàn)Xen虛擬機(jī)塊設(shè)備訪問過程中存在臨界資源沖突、工作負(fù)載分布不均等問題。采用并行優(yōu)化技術(shù)，為重要環(huán)節(jié)增加處理線程，將原單通道訪問方式改進(jìn)為雙通道訪問方式，緩解臨界資源爭(zhēng)用情況，提高工作效率。各個(gè)虛擬機(jī)的I/O需求不盡相同，在系統(tǒng)資源能夠滿足虛擬機(jī)需求總和的前提下，還需要有效的資源調(diào)度分配機(jī)制輔助系統(tǒng)運(yùn)行。Xen虛擬機(jī)當(dāng)前的虛擬塊設(shè)備帶寬分配機(jī)制僅實(shí)現(xiàn)平均分配，不能滿足用戶需求。通過分析虛擬塊設(shè)備對(duì)帶寬的不同需求情況，設(shè)計(jì)對(duì)應(yīng)的有限狀態(tài)機(jī)，并據(jù)此實(shí)現(xiàn)虛擬塊設(shè)備帶寬分配，使各個(gè)虛擬機(jī)能夠進(jìn)行虛擬塊設(shè)備帶寬動(dòng)態(tài)調(diào)整，按需獲取資源。 通過對(duì)改進(jìn)后的訪問方式進(jìn)行測(cè)試，證實(shí)相對(duì)原單通道訪問方式，雙通道訪問方式讀、寫請(qǐng)求效率分別提高17%和14%，提升系統(tǒng)整體性能。帶寬分配功能可以適應(yīng)復(fù)雜的虛擬塊設(shè)備工作環(huán)境，為特定的虛擬機(jī)提供最小帶寬保護(hù)，保證其運(yùn)行需求得到滿足。
[Abstract]:Server is the infrastructure of information service industry, but the utilization rate is generally low.Virtualization technology can improve server efficiency, reduce management complexity, and widely used in data centers.Block device is the main external device in the storage I / O system, and its access performance has an important impact on the overall operating efficiency of the system.There are a lot of concurrent access in virtualization environment, which makes the burden of block devices increase, and becomes a bottleneck restricting the overall performance.In order to solve the bottleneck problem of accessing virtual machine block devices, the open source virtual machine software Xen in Linux operating system is taken as an object to study the optimization scheme of access mode of virtual machine block devices.It is found that there are critical resource conflicts and uneven workload distribution in the process of accessing Xen virtual machine block devices.Parallel optimization technology is used to increase processing threads for important links, and the original single-channel access mode is improved to two-channel access mode, which alleviates critical resource contention and improves work efficiency.The I / O requirements of each virtual machine are different. If the system resources can meet the total requirements of the virtual machine,An effective resource scheduling and allocation mechanism is also needed to assist the system to run. Xen virtual machine. The current virtual block device bandwidth allocation mechanism can only achieve equal allocation and can not meet the needs of users.By analyzing the different requirements of the virtual block device, the corresponding finite state machine is designed, and the bandwidth allocation of the virtual block device is realized accordingly, which enables each virtual machine to dynamically adjust the bandwidth of the virtual block device and obtain the resources on demand.Through the test of the improved access mode, it is proved that compared with the original single-channel access mode, the two-channel access mode increases the efficiency of write request by 17% and 14%, respectively, and improves the overall performance of the system.The bandwidth allocation function can adapt to the complex working environment of virtual block devices, provide minimum bandwidth protection for a specific virtual machine, and ensure that its operational requirements are met.
【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】：2012
【分類號(hào)】：TP302

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