本文選題：磁盤 + 瓦記錄�。� 參考：《華中科技大學(xué)》2012年碩士論文

【摘要】：根據(jù)摩爾定律，磁存儲(chǔ)容量按照年60%的復(fù)合增長(zhǎng)率遞增。然而，受到超順磁效應(yīng)的影響，存儲(chǔ)面密度無法超越1Tb/in2的限制。為了進(jìn)一步提升磁存儲(chǔ)面密度，熱輔助記錄（heat-assisted recording, HAMR）和晶格記錄（bit patterned media, BPM）成為研究熱點(diǎn)。但是由于HAMR技術(shù)需要磁頭技術(shù)的突破，，BPM技術(shù)需要磁介質(zhì)材料技術(shù)的突破，兩個(gè)技術(shù)都無法實(shí)用化。瓦存儲(chǔ)技術(shù)采用磁道堆疊的方式存儲(chǔ)數(shù)據(jù)，不需要對(duì)磁頭和介質(zhì)本身進(jìn)行修正，就可以將存儲(chǔ)密度提高2-3倍，成為最有可能實(shí)用化的技術(shù)之一。然而瓦記錄由于采用覆蓋寫的技術(shù)而導(dǎo)致隨機(jī)寫性能嚴(yán)重衰減。如何解決此問題成為當(dāng)今研究的熱點(diǎn)。 采用日志方式修改地址映射邏輯，可有效的解決隨機(jī)寫性能衰減的問題。將瓦記錄磁盤劃分為很多存儲(chǔ)單元，當(dāng)一個(gè)存儲(chǔ)單元中的數(shù)據(jù)需要修改時(shí)，將修改追加到單元內(nèi)記錄的末尾；當(dāng)存儲(chǔ)單元的空間寫滿后，直接重新分配一個(gè)新的存儲(chǔ)單元，并將舊單元中的有效數(shù)據(jù)移動(dòng)至新單元。存儲(chǔ)設(shè)備上的軟件維護(hù)了一個(gè)從邏輯地址到物理地址的映射表，并且執(zhí)行將垃圾存儲(chǔ)單元回收整理的工作。提出了一種可行的瓦記錄數(shù)據(jù)組織策略，邏輯地址被映射為段、區(qū)、道、塊。通過虛擬塊設(shè)備的方式，建立瓦記錄模擬器。并將傳統(tǒng)虛擬磁盤和瓦記錄虛擬磁盤進(jìn)行性能橫向?qū)Ρ取?實(shí)驗(yàn)結(jié)果表明，采用提出的新型數(shù)據(jù)組織方式，瓦記錄磁盤在隨機(jī)讀寫小數(shù)據(jù)時(shí)性能與普通磁盤相當(dāng)甚至略有提升，在順序讀寫大數(shù)據(jù)時(shí)性能僅有10%左右的下降。
[Abstract]:According to Moore's law, the magnetic storage capacity increases with the compound growth rate of 60%. However, under the effect of superparamagnetic effect, the density of storage surface can not exceed the limit of 1Tb/in2. In order to further improve the density of magnetic storage surface (heat-assisted recording, HAMR) and lattice record (bit patterned media, BPM) become the hot spot of research. But because HAMR technology needs the breakthrough of magnetic head technology, BPM technology needs the breakthrough of magnetic medium material technology, the two technologies can not be applied. The tile storage technology stores data using the way of stacking of magnetic track. It does not need to correct the magnetic head and medium itself, so the storage density can be increased by 2-3 times to become the most likely practical technique. However, Watt record has severely weakened random write performance due to overwrite technology. How to solve this problem has become a hot research topic nowadays.
Modifying the address mapping logic by log method can effectively solve the problem of random write performance degradation. The tile record disk is divided into many storage units. When the data in a storage unit needs to be modified, the modification is added to the end of the record in the unit. When the space of the storage unit is full, a new memory is reassigned. The storage unit moves the valid data in the old unit to the new unit. The software on the storage device maintains a mapping table from the logical address to the physical address, and performs the work to reclaim the garbage storage unit. A feasible tile record data organization strategy is proposed, and the logical address is mapped into segments, zones, paths and blocks. In the way of virtual block device, a tile record simulator is set up, and the performance of traditional virtual disk and tile record virtual disk is contrasted.
The experimental results show that the performance of tile recording disk in random reading and writing of small data is even slightly improved by using the proposed new data organization method. The performance of the disk is only about 10% when reading and writing large data.
【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)】：TP333.35

【參考文獻(xiàn)】

相關(guān)期刊論文 前1條

1 李紅燕,王力;日志結(jié)構(gòu)文件系統(tǒng)技術(shù)的研究[J];計(jì)算機(jī)應(yīng)用研究;2003年01期

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