SNAT603CNT

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描述

SNAT603CNT

盡管重復(fù)刪除技術(shù)已經(jīng)逐漸成為一項(xiàng)熱門技術(shù)，但是很多分析師和用戶都提出，要謹(jǐn)慎的對(duì)待它，不要因?yàn)閺V告大肆宣傳而盲目追捧。
? ? 重復(fù)數(shù)據(jù)刪除技術(shù)旨在刪除冗余的備份數(shù)據(jù)、確保同樣的數(shù)據(jù)信息只被保存一次。最近，眾多廠商都相繼推出了整合該技術(shù)特性的解決方案。與此同時(shí)，一些用戶也開始使用這項(xiàng)技術(shù)來對(duì)海量數(shù)據(jù)進(jìn)行管理與控制。
? ? 其他一些潛在的用戶在面對(duì)五花八門的重復(fù)數(shù)據(jù)刪除方案時(shí)也顯得有些無所適從。在這里，專家為用戶列出了以下幾條建議：
? ? 1、詳細(xì)了解這項(xiàng)技術(shù)。盡管現(xiàn)在關(guān)于重復(fù)數(shù)據(jù)刪除技術(shù)的宣傳鋪天蓋地，但這并不意味著這項(xiàng)技術(shù)適合所有用戶應(yīng)用。StorageIO顧問公司的分析師GregSchulz表示：“重復(fù)數(shù)據(jù)刪除并不是刪除冗余數(shù)據(jù)的唯一方法?！彼€說，用戶可以考慮采用其他一些管理、簡(jiǎn)化數(shù)據(jù)的技術(shù)。
? ? &nb
? ? sp;在這里，他特別提到Storewiz等廠商所提供的數(shù)據(jù)壓縮技術(shù)。他說：“數(shù)據(jù)壓縮技術(shù)的數(shù)據(jù)刪除率比重復(fù)數(shù)據(jù)刪除低，但是前者的數(shù)據(jù)刪除率要比后者穩(wěn)定的多?！彼栽谕ǔＧ闆r下，數(shù)據(jù)壓縮技術(shù)的可靠性更高。
? ? Storewiz提供的數(shù)據(jù)壓縮技術(shù)不僅可以刪除冗余的備份數(shù)據(jù)，而且可以刪除冗余的主存儲(chǔ)器。與重復(fù)數(shù)據(jù)20:1到50:1之間的數(shù)據(jù)壓縮率相比，Storewiz的數(shù)據(jù)壓縮技術(shù)的壓縮率則在2:1到5:1之間（取決于數(shù)據(jù)和應(yīng)用程序的類型）。
? ? 2、明確你的需求是什么。在應(yīng)用重復(fù)數(shù)據(jù)刪除技術(shù)之前，用戶應(yīng)該認(rèn)真地想一想自己到底需要這項(xiàng)技術(shù)來實(shí)現(xiàn)什么目標(biāo)。“重復(fù)數(shù)據(jù)刪除的條件就是存在相同或者類似的信息?！盨chulz這樣說道，例如姓名或地址等相同的數(shù)據(jù)信息很容易被重復(fù)數(shù)據(jù)刪除技術(shù)列為要?jiǎng)h除或壓縮的對(duì)象。
? ? 3、選擇一個(gè)合適的、帶有重復(fù)數(shù)據(jù)刪除功能的解決方案。目前，各廠商在其硬件或軟件產(chǎn)品中提供了形式多樣的重復(fù)數(shù)據(jù)刪除技術(shù)策略。例如，DataDomain和Quantum推出了一種專門的重復(fù)數(shù)據(jù)應(yīng)用，而歸屬于EMC的Asigra和Avamar則推出了一種基于軟件的解決方案。此外，F(xiàn)alconStor和Sepaton等廠商還提供了一種為刪除的冗余數(shù)據(jù)創(chuàng)建VTL的解決方案。
? ? DragonSlayer咨詢公司的首席分析師MarcStaimer說：“我個(gè)人更傾向于將重復(fù)數(shù)據(jù)刪除技術(shù)整合加入到軟件產(chǎn)品中的解決方案，這樣我就可以自己決定使用哪一款軟件?！彼J(rèn)為VTL和基于應(yīng)用的重復(fù)數(shù)據(jù)刪除都是有局限性的?！八拗屏瞬僮鞯撵`活性，也就是說，如果我采用了其他廠商提供的VTL，就會(huì)帶來許多問題，”
? ? 4、Inlineprocessing與Postprocessing。重復(fù)數(shù)據(jù)刪除技術(shù)被分為兩大類：Domain、Diligent等提供的Inlineprocessing和由Sepaton、FalconStor等提供的Postprocessing。目前，只有昆騰能夠在一個(gè)解決方案中既提供Inlineprocessing技術(shù)又提供Postprocessing技術(shù)。
? ? Inlineprocessing發(fā)生在數(shù)據(jù)從備份服務(wù)器接收并存儲(chǔ)到磁盤的時(shí)候，而Postprocessing通常發(fā)生在備份處理之后，避免了備份和重復(fù)數(shù)據(jù)刪除之間發(fā)生沖突。目前，支持Inlineprocessing和Postprocessing的兩大陣營(yíng)不分上下，但是又有第三個(gè)陣營(yíng)表示更傾向于將Inlineprocessing和Postprocessing相互整合。
? ? 雖然Postprocessing技術(shù)不會(huì)減緩數(shù)據(jù)備份的處理過程，但是Postprocessing更適合那些大型企業(yè)，因?yàn)橥ǔ＿@些大型企業(yè)可以為那些還沒有被刪除的冗余數(shù)據(jù)提供富余的存儲(chǔ)空間。
? ? 5、提前考慮到安全問題。教育服務(wù)提供商T
? ? imecruiser的CTOJamesWang認(rèn)為，由于重復(fù)數(shù)據(jù)強(qiáng)調(diào)的是單實(shí)例存儲(chǔ)，所以這給用戶帶來了新的安全問題。他說：“如果你執(zhí)行了重復(fù)數(shù)據(jù)刪除，數(shù)據(jù)信息的多個(gè)副本都會(huì)被刪除，最后只保留一個(gè)副本，于是你就不得不格外謹(jǐn)慎地保留這個(gè)副本?！?/div>
? ? 之前，Timecruiser每天都會(huì)保存當(dāng)天所有的數(shù)據(jù)副本，而現(xiàn)在它只保存其中的一部分了。為了增強(qiáng)安全性，Wang和他的技術(shù)小組正研究向其重復(fù)數(shù)據(jù)刪除的基礎(chǔ)架構(gòu)中整合加入遠(yuǎn)程復(fù)制功能，將公司的數(shù)據(jù)信息復(fù)制到一臺(tái)遠(yuǎn)地的存儲(chǔ)設(shè)備上。

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選擇深圳長(zhǎng)欣，選擇放心，售后無憂大量現(xiàn)貨，當(dāng)天順豐發(fā)貨！
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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)起來也就簡(jiǎn)單了。

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