本文選題：混合存儲(chǔ)　切入點(diǎn)：現(xiàn)場(chǎng)可編程門(mén)陣列　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

【摘要】：固態(tài)盤(pán)（SolidStateDisk，SSD）存儲(chǔ)技術(shù)最近幾年飛速發(fā)展，憑借其優(yōu)異的性能占領(lǐng)了部分市場(chǎng)。但SSD在壽命和成本上仍然與硬盤(pán)（HardwareDiskDrive，HDD）有比較大的差距。因此，在消費(fèi)類(lèi)市場(chǎng)中SSD的高成本使其無(wú)法普及，而在企業(yè)應(yīng)用中其可靠性又不足。另一方面，HDD已經(jīng)越來(lái)越不能滿(mǎn)足系統(tǒng)對(duì)I/O的高速請(qǐng)求。因此，出現(xiàn)了利用SSD和HDD這兩種存儲(chǔ)技術(shù)優(yōu)勢(shì)而將其結(jié)合的混合存儲(chǔ)技術(shù)。通過(guò)使用這種混合存儲(chǔ)技術(shù)希望得到接近于SSD的性能而具有HDD的大容量并延長(zhǎng)系統(tǒng)整體壽命。 I-CASH（IntelligentlyCoupledArrayofSSDandHDD）則是一種將SSD和HDD并列使用的混合存儲(chǔ)系統(tǒng)。I-CASH利用了數(shù)據(jù)的內(nèi)容局部性原理，將不常改變的參考頁(yè)數(shù)據(jù)存入SSD中，而只將各數(shù)據(jù)頁(yè)相對(duì)于參考頁(yè)數(shù)據(jù)不同的差異數(shù)據(jù)存入HDD中。這樣相對(duì)于HDD來(lái)說(shuō)實(shí)現(xiàn)了數(shù)據(jù)壓縮的功能，從而系統(tǒng)可以獲得若干倍HDD的性能；另外由于減少了對(duì)SSD的寫(xiě)操作，因此系統(tǒng)也可以獲得比SSD更長(zhǎng)的壽命。 對(duì)于I-CASH的結(jié)構(gòu)設(shè)計(jì)，使用了SOC主控芯片實(shí)現(xiàn)方案，該方案由主控芯片內(nèi)部的專(zhuān)用硬件電路完成最主要的數(shù)據(jù)計(jì)算，芯片內(nèi)部的CPU則只負(fù)責(zé)較簡(jiǎn)單的數(shù)據(jù)管理；在對(duì)I-CASH系統(tǒng)的實(shí)現(xiàn)方面，由于方案整體的復(fù)雜性，僅對(duì)上述方案中涉及的I-CASH頁(yè)壓縮子系統(tǒng)的設(shè)計(jì)及其在FPGA上的實(shí)現(xiàn)進(jìn)行了深入研究，給出了頁(yè)壓縮子系統(tǒng)的結(jié)構(gòu)，介紹了它的搭建、各模塊的功能和其配置，特別是核心模塊數(shù)據(jù)處理單元頁(yè)壓縮模塊的verilog實(shí)現(xiàn)；在頁(yè)壓縮數(shù)據(jù)處理方面，提出了頁(yè)壓縮的算法及差異數(shù)據(jù)在HDD中存儲(chǔ)的格式，使系統(tǒng)獲得較好的數(shù)據(jù)壓縮率。 經(jīng)在FPGA開(kāi)發(fā)板上進(jìn)行驗(yàn)證，I-CASH頁(yè)壓縮子系統(tǒng)可以正確完成數(shù)據(jù)頁(yè)壓縮和解壓縮。通過(guò)修改參考頁(yè)數(shù)據(jù)和寫(xiě)入的數(shù)據(jù)，對(duì)各種情況下數(shù)據(jù)壓縮的性能進(jìn)行了分析。系統(tǒng)整體數(shù)據(jù)壓縮處理速度約為150MB/s。
[Abstract]:Solid State disk disk (SD) storage technology has developed rapidly in recent years and has occupied part of the market with its excellent performance. However, SSD still has a big gap in life and cost compared with hard ware disk driven DDS. The high cost of SSD in the consumer market makes it difficult to popularize, but it is not reliable enough in enterprise application. On the other hand, HDDs are no longer able to meet the system's high speed request for I / O. There is a hybrid storage technology which combines SSD and HDD to achieve the performance close to that of SSD, which has the large capacity of HDD and prolongs the whole life of the system. I-CASHH Intelligent coupled system of SD and HDD is a hybrid storage system that uses SSD and HDD side by side. I-CASH makes use of the principle of content localization of data and stores the data of reference pages that are not changed often in SSD. And only the different data of each data page relative to the reference page is stored in HDD. In this way, the function of data compression is realized relative to HDD, so the system can obtain several times the performance of HDD. In addition, because of the reduction of writing operation to SSD, As a result, the system can also achieve a longer life than the SSD. For the structure design of I-CASH, the implementation scheme of SOC master control chip is used. The main data calculation is accomplished by the special hardware circuit inside the main control chip, while the CPU inside the chip is only responsible for the simple data management. In the implementation of I-CASH system, due to the overall complexity of the scheme, only the design of I-CASH page compression subsystem and its implementation on FPGA are studied deeply, and the structure of the page compression subsystem is given. This paper introduces its construction, function and configuration of each module, especially the verilog implementation of the data processing unit page compression module of the core module, and puts forward the algorithm of page compression and the format of the difference data stored in the HDD in the aspect of page compression data processing. Make the system obtain better data compression ratio. It is verified on the FPGA development board that the compression subsystem of I-CASH pages can correctly complete the compression and decompression of data pages. The performance of data compression in various cases is analyzed. The data compression speed of the whole system is about 150 MB / s.
【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

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本文編號(hào)：1566527