6SC9811-4CK02

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描述

6SC9811-4CK02

衡量性能的幾個指標(biāo)的計算中我們可以看到一個15k轉(zhuǎn)速的磁盤在隨機讀寫訪問的情況下IOPS竟然只有140左右,但在實際應(yīng)用中我們卻能看到很多標(biāo)有5000IOPS甚至更高的存儲系統(tǒng),有這么大IOPS的存儲系統(tǒng)怎么來的呢?這就要歸結(jié)于各種存儲技術(shù)的使用了,在這些存儲技術(shù)中使用最廣的就是高速緩存(Cache)和磁盤冗余陣列(RAID)了,本文就將探討緩存和磁盤陣列提高存儲IO性能的方法。
? ? 高速緩存(Cache)
? ? 在當(dāng)下的各種存儲產(chǎn)品中,按照速度從快到慢應(yīng)該就是內(nèi)存>閃存>磁盤>磁帶了,然而速度越快也就意味著價格越高,閃存雖然說是發(fā)展勢頭很好,但目前來說卻還是因為價格問題無法普及,因此現(xiàn)在還是一個磁盤作霸王的時代。與CPU和內(nèi)存速度相比,磁盤的速度無疑是計算機系統(tǒng)中最大的瓶頸了,所以在必須使用磁盤而又想提高性能的情況下,人們想出了在磁盤中嵌入一塊高速的內(nèi)存用來保存經(jīng)常訪問的數(shù)據(jù)從而提高讀寫效率的方法來折中的解決,這塊嵌入的內(nèi)存就被稱為高速緩存。
? ? 說到緩存,它的應(yīng)用現(xiàn)在已經(jīng)是無處不在,從處于上層的應(yīng)用,到操作系統(tǒng)層,再到磁盤控制器,還有CPU內(nèi)部,單個磁盤的內(nèi)部也都存在緩存,所有這些緩存存在的目的都是相同的,就是提高系統(tǒng)執(zhí)行的效率。
? ? 當(dāng)然在這里我們只提跟IO性能相關(guān)的緩存,與IO性能直接相關(guān)的幾個緩存分別是文件系統(tǒng)緩存(FileSySTemCache)、磁盤控制器緩存(DiskCONtrollerCache)和磁盤緩存(DiskCache,也稱為DiskBuffer),不過當(dāng)在計算一個磁盤系統(tǒng)性能的時候文件系統(tǒng)緩存也是不會考慮在內(nèi)的,我們重點考察的就是磁盤控制器緩存和磁盤緩存。
? ? 不管是控制器緩存還是磁盤緩存,他們所起的作用主要是分為三部分:緩存數(shù)據(jù)、預(yù)讀(Read-ahead)和回寫(Write-back)。

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主營DCS系統(tǒng)配件
機器人系統(tǒng)配件
大型伺服系統(tǒng)配件
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專業(yè)銷售進(jìn)口DCS? PLC系統(tǒng)備件模塊

PLC模塊,可編程控制器,CPU模塊,IO模塊,AI模塊,通訊模塊。AB/施耐德/ABB/GE/本特利/西屋/英維斯/霍尼韋爾/黑馬/FU克斯波羅

15天包退換 一年質(zhì)保 大量現(xiàn)貨? 國內(nèi)實力庫存商家


選擇深圳長欣,選擇放心,售后無憂大量現(xiàn)貨,當(dāng)天順豐發(fā)貨!
主營:本特利,英維思,伍德沃德,福克斯波羅、西屋、瑞恩、施耐德莫迪康、ABB、AB、西門子、摩托羅拉、GE發(fā)那科、安川、博世力士樂,ACSO,力士樂等各大品牌的DCS系統(tǒng)配件,機器人系統(tǒng)配件,大型伺服系統(tǒng)備件。

先介紹幾點經(jīng)驗。
1、先通讀一遍“系統(tǒng)手冊”(不管能不能看懂,先了解個大概,以便學(xué)習(xí)編程時查找);
2、由位控邏輯入手,逐漸增加定時、計數(shù)等條件,把或、與、非關(guān)系理順;
3、進(jìn)而練習(xí)整數(shù)運算、實數(shù)運算、類型轉(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(最好是有個物理回路驗證,比如變頻器+電機+測速傳感器);
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)機器人配件DSQC系列和Motorola MVME系列,GE 卡件 模塊 驅(qū)動器系列為主攻。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)會一種至于其它的學(xué)習(xí)起來也就簡單了。