描述

3HNA014320-001

自動精簡配置（ThinProvisioning）是一項(xiàng)對存儲資源的自動分配和利用，以避免磁盤空間被無限制索取的技術(shù)。如今，越來越多的用戶開始討論這項(xiàng)技術(shù)的好處，媒體也開始競相報道，看來自動精簡配置已經(jīng)逐漸成為人們關(guān)注的熱點(diǎn)。

? ? Compellent、Datacore、Pillar和3PAR等廠商也都開始在自己的產(chǎn)品中添加了自動精簡配置功能來做為增加收入的賣點(diǎn)。老牌系統(tǒng)供應(yīng)商日立數(shù)據(jù)系統(tǒng)（HDS）也在由惠普OEM、Sun代售的UniversalStoragePlatformV產(chǎn)品中加入了自動精簡配置功能。NetApp除了與3PAR合作之外，還向其文件存儲應(yīng)用中加入了該項(xiàng)技術(shù)。此外，一些iSCSI廠商也不甘落后，紛紛加入到應(yīng)用自動精簡配置技術(shù)的行列中來。

? ? 但這不意味著自動精簡配置沒有弊端。3PAR的首席執(zhí)行官DavidScott就指出執(zhí)行這項(xiàng)功能時對容量上限的監(jiān)控的

? ? 重要性。一些較早使用自動精簡配置技術(shù)的用戶也表示，如果操作不當(dāng)?shù)脑挘蜁o你帶來許多麻煩。

? ? 問題是，怎樣才算是正確的操作呢？這里有幾個成功應(yīng)用自動精簡配置技術(shù)的例子，其中包括總部在美國密歇根州的律師事務(wù)所Dickinson-WrightPLLC（EqualLogic的用戶）、Priceline.com（3PAR的用戶）、歐洲領(lǐng)先的衛(wèi)星運(yùn)營商SESASTRA（Datacore的用戶）、英國SunlightServiceGroup（3PAR的用戶）和UnitedAirlines（HDS的用戶）。

? ? 不管怎樣，成功的例子肯定都有共同點(diǎn)。為了找到這些共同點(diǎn)，我們采訪了有關(guān)這項(xiàng)技術(shù)的供應(yīng)商、專家和用戶，最后列出了以下幾條使用自動精簡配置的需要注意的問題：

? ? 1、不要輕易相信廣告宣傳。StorageIO顧問公司的分析師GregSchulz認(rèn)為：“因?yàn)閺V告宣傳的解決方案表面上是一目了然的，實(shí)際上并非如此。你應(yīng)該仔細(xì)詢問，并要求他們給你演示一下這個解決方案的用途是什么，考查清楚它的拓展性。如果這個解決方案并不適用于你的應(yīng)用環(huán)境，那么它對你來說就毫無用處?！?/div>

? ? 2、特別注意架構(gòu)的差異，避免主觀臆斷。每個廠商提供的自動精簡配置技術(shù)策略都是有所不同的。例如3PAR的自動精簡技術(shù)就將物理磁盤陣列分為幾個大的存儲塊，并要求用戶的卷容量為特定大小，系統(tǒng)就會自動為其分配物理存儲空間。你必須使用3PAR的陣列才能完成這項(xiàng)工作。相比之下，HDS則創(chuàng)建了一個硬盤RAID組的存儲池。當(dāng)磁盤實(shí)際容量增加時，操作人員必須對盤卷做出調(diào)整。你可能會繼續(xù)使用HDS提供的方案，但是你不得不手動操作才能執(zhí)行自動精簡配置了。

? ? 3、選擇一種適合你自身基礎(chǔ)架構(gòu)的解決方案。你采用哪種存儲方式就決定了你得選擇哪種自動精簡配置方案。就像上文提到的，如果你選擇了3PAR的解決方案，你就需要使用3PAR提供的硬件產(chǎn)品。如果你繼續(xù)堅(jiān)持采用HDS的方案，那么就不得不手動配置存儲池中的LUN。如果選擇了Datacore，你就可以采用多種第三方陣列——只要你對Datacore提供的軟件特性或功能都很滿意。

? ? 4、查看運(yùn)行的影響。正如上文所提到的，自動精簡配置方案由于所要求的手動操作和管理監(jiān)控等條件而有所不同。但不管怎樣，這都不會影響你的選擇。HDS首席科學(xué)家兼業(yè)內(nèi)專家ClausMikkelsen認(rèn)為，所有的存儲配置都需要具備存儲的專業(yè)技能?！澳阈枰崆霸O(shè)置好容量限制?！彼岬?，HDS對存儲池、LUN和陣列都設(shè)定了默認(rèn)臨界值。用戶需要在常規(guī)存儲配置過程中來設(shè)定這些臨界值，而自動精簡配置則大大簡化了這個過程。

? ? 5、對數(shù)據(jù)了如指掌。有人說，只有真正了解數(shù)據(jù)信息是如何占用存儲空間，你才可以更好地利用自動精簡配置技術(shù)。關(guān)鍵是要掌握應(yīng)用程序的增長速率，并且可以預(yù)測出什么時候不需要自動精簡配置而真正配置更多的存儲空間。GregSchulz說：“如果一個應(yīng)用程序經(jīng)常涉及到數(shù)據(jù)塊，例如數(shù)據(jù)庫的碎片整理和列表優(yōu)化，那么存儲空間

? ? 的需求量可能會達(dá)到峰值?！睘榱吮苊夤收习l(fā)生，你必須對數(shù)據(jù)的處理和這些數(shù)據(jù)需要占用的存儲空間大小等情況非常了解。

? ? 6、檢查與存儲管理的兼容性。自動精簡配置功能往往是與特定廠商的存儲方案捆綁銷售的，所以你需要檢查自動精簡配置功能是否能與你現(xiàn)在所使用存儲管理應(yīng)用程序兼容。有些時候，如果你配置了自動精簡功能，那么監(jiān)控功能或SRM應(yīng)用等都無法正常使用了。所以為了避免這種情況的發(fā)生，一定要提前檢查清楚。

? ? 基于以上這幾點(diǎn)，我們就可以理解為什么很多用戶都不急于采用這項(xiàng)技術(shù)，而是先耐心地觀望一段時間?，F(xiàn)在許多廠商提供的解決方案都是與該廠商的某款硬件產(chǎn)品捆綁銷售的，所以很難對某個廠商的產(chǎn)品作出定論。目前，數(shù)據(jù)量驟增而資金預(yù)算卻沒有增加，自動精簡配置無疑在存儲網(wǎng)絡(luò)中變得越來越重要。

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3HNA014320-001

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