DSDX-4515716075-K

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DSDX-4515716075-K

預(yù)讀是指采用預(yù)讀算法在沒(méi)有系統(tǒng)的IO請(qǐng)求的時(shí)候事先將數(shù)據(jù)從磁盤(pán)中讀入到緩存中，然后在系統(tǒng)發(fā)出讀IO請(qǐng)求的時(shí)候，就會(huì)實(shí)現(xiàn)去檢查看看緩存里面是否存在要讀取的數(shù)據(jù)，如果存在(即命中)的話就直接將結(jié)果返回，這時(shí)候的磁盤(pán)不再需要尋址、旋轉(zhuǎn)等待、讀取數(shù)據(jù)這一序列的操作了，這樣是能節(jié)省很多時(shí)間的;如果沒(méi)有命中則再發(fā)出真正的讀取磁盤(pán)的命令去取所需要的數(shù)據(jù)。
緩存的命中率跟緩存的大小有很大的關(guān)系，理論上是緩存越大的話，所能緩存的數(shù)據(jù)也就越多，這樣命中率也自然越高，當(dāng)然緩存不可能太大，畢竟成本在那兒呢。如果一個(gè)容量很大的存儲(chǔ)系統(tǒng)配備了一個(gè)很小的讀緩存的話，這時(shí)候問(wèn)題會(huì)比較大的，因?yàn)樾【彺婢彺娴臄?shù)據(jù)量非常小，相比整個(gè)存儲(chǔ)系統(tǒng)來(lái)說(shuō)比例非常低，這樣隨機(jī)讀取(數(shù)據(jù)庫(kù)系統(tǒng)的大多數(shù)情況)的時(shí)候命中率也自然就很低，這樣的緩存不但不能提高效率(因?yàn)榻^大部分讀IO都還要讀取磁盤(pán))，反而會(huì)因?yàn)槊看稳テヅ渚彺娑速M(fèi)時(shí)間。

執(zhí)行讀IO操作是讀取數(shù)據(jù)存在于緩存中的數(shù)量與全部要讀取數(shù)據(jù)的比值稱(chēng)為緩存命中率(ReadCacheHitRadio)，假設(shè)一個(gè)存儲(chǔ)系統(tǒng)在不使用緩存的情況下隨機(jī)小IO讀取能達(dá)到150IOPS，而它的緩存能提供10%的緩存命中率的話，那么實(shí)際上它的IOPS可以達(dá)到150/(1-10%)=166。回寫(xiě)

要先說(shuō)一下，用于回寫(xiě)功能的那部分緩存被稱(chēng)為寫(xiě)緩存(WriteCache)。在一套寫(xiě)緩存打開(kāi)的存儲(chǔ)中，操作系統(tǒng)所發(fā)出的一系列寫(xiě)IO命令并不會(huì)被挨個(gè)的執(zhí)行，這些寫(xiě)IO的命令會(huì)先寫(xiě)入緩存中，然后再一次性的將緩存中的修改推到磁盤(pán)中，這就相當(dāng)于將那些相同的多個(gè)IO合并成一個(gè)，多個(gè)連續(xù)操作的小IO合并成一個(gè)大的IO，還有就是將多個(gè)隨機(jī)的寫(xiě)IO變成一組連續(xù)的寫(xiě)IO，這樣就能減少磁盤(pán)尋址等操作所消耗的時(shí)間，大大的提高磁盤(pán)寫(xiě)入的效率。讀緩存雖然對(duì)效率提高是很明顯的，但是它所帶來(lái)的問(wèn)題也比較嚴(yán)重，因?yàn)榫彺婧推胀▋?nèi)存一樣，掉點(diǎn)以后數(shù)據(jù)會(huì)全部丟失，當(dāng)操作系統(tǒng)發(fā)出的寫(xiě)IO命令寫(xiě)入到緩存中后即被認(rèn)為是寫(xiě)入成功，而實(shí)際上數(shù)據(jù)是沒(méi)有被真正寫(xiě)入磁盤(pán)的，此時(shí)如果掉電，緩存中的數(shù)據(jù)就會(huì)永遠(yuǎn)的丟失了，這個(gè)對(duì)應(yīng)用來(lái)說(shuō)是災(zāi)難性的，目前解決這個(gè)問(wèn)題最好的方法就是給緩存配備電池了，保證存儲(chǔ)掉電之后緩存數(shù)據(jù)能如數(shù)保存下來(lái)。
和讀一樣，寫(xiě)緩存也存在一個(gè)寫(xiě)緩存命中率(WriteCacheHitRadio)，不過(guò)和讀緩存命中情況不一樣的是，盡管緩存命中，也不能將實(shí)際的IO操作免掉，只是被合并了而已。
控制器緩存和磁盤(pán)緩存除了上面的作用之外還承當(dāng)著其他的作用，比如磁盤(pán)緩存有保存IO命令隊(duì)列的功能，單個(gè)的磁盤(pán)一次只能處理一個(gè)IO命令，但卻能接收多個(gè)IO命令，這些進(jìn)入到磁盤(pán)而未被處理的命令就保存在緩存中的IO隊(duì)列中。RAID(RedundantArrayOfInexpensiveDisks)
如果你是一位數(shù)據(jù)庫(kù)管理員或者經(jīng)常接觸服務(wù)器，那對(duì)RAID應(yīng)該很熟悉了，作為最廉價(jià)的存儲(chǔ)解決方案，RAID早已在服務(wù)器存儲(chǔ)中得到了普及。在RAID的各個(gè)級(jí)別中，應(yīng)當(dāng)以RAID10和RAID5(不過(guò)RAID5已經(jīng)基本走到頭了，RAID6正在崛起中，看看這里了解下原因)應(yīng)用最廣了。下面將就RAID0，RAID1，RAID5，RAID6，RAID10這幾種級(jí)別的RAID展開(kāi)說(shuō)一下磁盤(pán)陣列對(duì)于磁盤(pán)性能的影響，當(dāng)然在閱讀下面的內(nèi)容之前你必須對(duì)各個(gè)級(jí)別的RAID的結(jié)構(gòu)和工作原理要熟悉才行，這樣才不至于滿頭霧水，推薦查看wikipedia上面的如下條目：RAID，StandardRAIDlevels，NestedRAIDlevels。RAID0RAID0將數(shù)據(jù)條帶化(striping)將連續(xù)的數(shù)據(jù)分散在多個(gè)磁盤(pán)上進(jìn)行存取，系統(tǒng)發(fā)出的IO命令(不管讀IO和寫(xiě)IO都一樣)就可以在磁盤(pán)上被并行的執(zhí)行，每個(gè)磁盤(pán)單獨(dú)執(zhí)行自己的那一部分請(qǐng)求，這樣的并行的IO操作能大大的增強(qiáng)整個(gè)存儲(chǔ)系統(tǒng)的性能。假設(shè)一個(gè)RAID0陣列有n(n>=2)個(gè)磁盤(pán)組成，每個(gè)磁盤(pán)的隨機(jī)讀寫(xiě)的IO能力都達(dá)到140的話，那么整個(gè)磁盤(pán)陣列的IO能力將是140n。同時(shí)如果在陣列總線的傳輸能力允許的話RAID0的吞吐率也將是單個(gè)磁盤(pán)的n倍。

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15天包退換 一年質(zhì)保 大量現(xiàn)貨? 國(guó)內(nèi)實(shí)力庫(kù)存商家


選擇深圳長(zhǎng)欣，選擇放心，售后無(wú)憂大量現(xiàn)貨，當(dāng)天順豐發(fā)貨！
主營(yíng)：本特利，英維思，伍德沃德，?？怂共_、西屋、瑞恩、施耐德莫迪康、ABB、AB、西門(mén)子、摩托羅拉、GE發(fā)那科、安川、博世力士樂(lè)，ACSO，力士樂(lè)等各大品牌的DCS系統(tǒng)配件，機(jī)器人系統(tǒng)配件，大型伺服系統(tǒng)備件。

先介紹幾點(diǎn)經(jīng)驗(yàn)。
1、先通讀一遍“系統(tǒng)手冊(cè)”（不管能不能看懂，先了解個(gè)大概，以便學(xué)習(xí)編程時(shí)查找）；
2、由位控邏輯入手，逐漸增加定時(shí)、計(jì)數(shù)等條件，把或、與、非關(guān)系理順；
3、進(jìn)而練習(xí)整數(shù)運(yùn)算、實(shí)數(shù)運(yùn)算、類(lèi)型轉(zhuǎn)換；
4、量程轉(zhuǎn)換、PID調(diào)節(jié)回路的建立及P、I、D參數(shù)的理解（最好是有個(gè)物理回路驗(yàn)證，比如變頻器+電機(jī)+測(cè)速傳感器）；
5、循環(huán)、順序、跳轉(zhuǎn)等程序控制（盡量避免跳轉(zhuǎn)，非跳不可時(shí)也是跳的越近越好）；
6、中斷、通訊、位置控制....

本人以ABB工業(yè)機(jī)器人配件DSQC系列和Motorola MVME系列，GE 卡件 模塊 驅(qū)動(dòng)器系列為主攻。各位電工朋友可根據(jù)自己的條件選擇適合自己的PLC品牌，由于PLC的基本框架大同小異，學(xué)會(huì)一種至于其它的學(xué)習(xí)起來(lái)也就簡(jiǎn)單了。

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