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單邊加速的**技術(shù)理念在于，通過(guò)自動(dòng)、實(shí)時(shí)、持續(xù)、動(dòng)態(tài)地偵測(cè)網(wǎng)絡(luò)路徑中的延遲、丟包、重傳的情況，改變傳出機(jī)制和改善傳輸擁塞機(jī)制，避免數(shù)據(jù)報(bào)文的過(guò)度重發(fā)，從而減少應(yīng)用響應(yīng)時(shí)間并提升TCP傳輸效率。由于是針對(duì)所有TCP數(shù)據(jù)流進(jìn)行優(yōu)化，因此不僅文件、電子郵件、網(wǎng)站等應(yīng)用可以通過(guò)該技術(shù)實(shí)現(xiàn)加***果，而且只要運(yùn)行于TCP之上的應(yīng)用，山西什么是負(fù)載均衡是什么，都可以通過(guò)深信服AD單邊加速技術(shù)提升用戶(hù)的訪問(wèn)體驗(yàn)。 </p> <p> 隨著業(yè)務(wù)系統(tǒng)對(duì)網(wǎng)絡(luò)的依賴(lài)程度越來(lái)越大，對(duì)IT管理維護(hù)人員的要求也越來(lái)越高。為應(yīng)對(duì)日趨復(fù)雜的用戶(hù)訪問(wèn)需求，深信服AD提供智能路由技術(shù)、DNS透明代理技術(shù)以及鏈路繁忙控制技術(shù)，山西什么是負(fù)載均衡是什么，實(shí)現(xiàn)基于鏈路的負(fù)荷情況、時(shí)間段、用戶(hù)群體、訪問(wèn)對(duì)象等因素來(lái)分配鏈路的分配機(jī)制，山西什么是負(fù)載均衡是什么，進(jìn)一步提升鏈路優(yōu)化使用率。服務(wù)器負(fù)載均衡原先被創(chuàng)造出來(lái)用以解決網(wǎng)絡(luò)方面的問(wèn)題。山西什么是負(fù)載均衡是什么</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="山西什么是負(fù)載均衡是什么,負(fù)載均衡" src="http://tyunfile.71360.com/UploadFile/heixiang4/637167061602539062/936592.jpg"></div><p> <br /> </p> <p> <br /> </p> <p> ? 快速恢復(fù)－快速檢測(cè)出丟包，并能快速準(zhǔn)確重傳該包，對(duì)時(shí)延較大，網(wǎng)絡(luò)狀況較差的情況能夠有效的提升帶寬利用率，通過(guò)更改快速恢復(fù)過(guò)程中發(fā)送端可以用來(lái)提高發(fā)送速率的方法，提供更大的吞吐量。 </p> <p> ? 慢啟動(dòng)－避免發(fā)送 TCP 對(duì)等方擁塞整個(gè)網(wǎng)絡(luò)的現(xiàn)有算法被稱(chēng)為“慢啟動(dòng)”和“擁塞避免”。在連接**初發(fā)送數(shù)據(jù)和還原丟失段時(shí)，這些算法可以增大發(fā)送窗口，即發(fā)送端可以發(fā)送的段數(shù)量。對(duì)于每個(gè)接收到的確認(rèn)段或每個(gè)已經(jīng)確認(rèn)的段，“慢啟動(dòng)”算法會(huì)以一個(gè)完整的 TCP 段增大發(fā)送窗口。對(duì)于每個(gè)已經(jīng)確認(rèn)的完整窗口的數(shù)據(jù)，“擁塞避免”算法以一個(gè)完整的TCP 段增大發(fā)送窗口。利用這些算法增大發(fā)送窗口的速度就足以充分利用連接帶寬。山西什么是負(fù)載均衡是什么可以識(shí)別客戶(hù)與服務(wù)器之間交互過(guò)程的關(guān)連性。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="山西什么是負(fù)載均衡是什么,負(fù)載均衡" src="http://tyunfile.71360.com/UploadFile/heixiang4/637172002901630860/7755282.png"></div><p> <br /> </p> <p> <br /> </p> <p> ? 基于觀測(cè)方式的被動(dòng)檢查－根據(jù)觀測(cè)到的服務(wù)器連接數(shù)，上下行數(shù)據(jù)報(bào)文等參數(shù)，判定服務(wù)器節(jié)點(diǎn)是否有效。例如，通過(guò)監(jiān)控到業(yè)務(wù)流中的HTTP403、404錯(cuò)誤等內(nèi)容，或者感知到大量的RST關(guān)閉連接、零窗口等異常TCP傳輸行為，判斷出服務(wù)器已經(jīng)失效，進(jìn)而將用戶(hù)的訪問(wèn)請(qǐng)求分配到其他有效的服務(wù)器之上。 </p> <p> ? 自定義內(nèi)容檢查機(jī)制－是通過(guò)預(yù)設(shè)自定義字符串，來(lái)判斷服務(wù)器應(yīng)用是否運(yùn)行正常；如對(duì)某個(gè)應(yīng)用用戶(hù)通過(guò)預(yù)先設(shè)定該應(yīng)用正常返回包中應(yīng)該包含的字符串，深信服AD檢驗(yàn)服務(wù)器返回?cái)?shù)據(jù)包內(nèi)是否包含了該特定內(nèi)容，如果沒(méi)有包含該內(nèi)容，就認(rèn)定該服務(wù)器故障，將用戶(hù)的訪問(wèn)請(qǐng)求分配到其他健康的服務(wù)器之上。 </p><p> 當(dāng)需要進(jìn)行系統(tǒng)維護(hù)或者服務(wù)器升級(jí)時(shí)，通過(guò)服務(wù)器平滑退出機(jī)制，深信服AD設(shè)備能夠保證服務(wù)器退出時(shí)不會(huì)造成用戶(hù)的訪問(wèn)中斷。一旦管理人員選定某臺(tái)服務(wù)器要從服務(wù)器組內(nèi)退出服務(wù)后，深信服AD設(shè)備將不會(huì)把新的用戶(hù)分配到該服務(wù)器。當(dāng)該服務(wù)器處理完當(dāng)前用戶(hù)的訪問(wèn)之后，就可以開(kāi)始進(jìn)行對(duì)服務(wù)器的相應(yīng)管理和維護(hù)了。 </p> <p> 將新購(gòu)置或維護(hù)后的服務(wù)器添加到服務(wù)器組時(shí)，深信服AD設(shè)備可以通過(guò)溫暖上線方式，避免新服務(wù)器由于激增流量的沖擊而導(dǎo)致系統(tǒng)故障，實(shí)現(xiàn)服務(wù)器的平滑進(jìn)入。當(dāng)新服務(wù)器上線后，在其恢復(fù)時(shí)間內(nèi)，AD設(shè)備不會(huì)向該服務(wù)器發(fā)送請(qǐng)求；而在隨后的溫暖時(shí)間以?xún)?nèi)，AD設(shè)備則會(huì)逐漸地增加分配到該服務(wù)器的請(qǐng)求，使新服務(wù)器的壓力緩慢增加到穩(wěn)定狀態(tài)，從而保證服務(wù)器在啟動(dòng)期間以及應(yīng)用程序初始化時(shí)都能提供不間斷的服務(wù)。應(yīng)用交付技術(shù)發(fā)展至今已經(jīng)十分成熟。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="山西什么是負(fù)載均衡是什么,負(fù)載均衡" src="http://tyunfile.71360.com/UploadFile/heixiang4/637172002901464844/6884525.png"></div><p> <br /> </p> <p> <br /> </p> <p> 實(shí)現(xiàn)機(jī)制－將所有網(wǎng)絡(luò)鏈路放在一個(gè)隊(duì)列當(dāng)中，按順序依次返回給用戶(hù)隊(duì)列中下一個(gè)網(wǎng)絡(luò)鏈路的IP地址。 </p> <p> 適用場(chǎng)景－擁有多條同一運(yùn)營(yíng)商的互聯(lián)網(wǎng)鏈路，各條鏈路的帶寬也相近。 </p> <p> 1. 加權(quán)輪詢(xún)（Weighted Round Robin） </p> <p> 實(shí)現(xiàn)機(jī)制－由于各條互聯(lián)網(wǎng)鏈路的吞吐量可能不一，因此可以為各條鏈路分配不同的加權(quán)值。根據(jù)這個(gè)比例，把數(shù)據(jù)用戶(hù)請(qǐng)求輪詢(xún)分配到每條鏈路。 </p> <p> 適用場(chǎng)景－擁有多條同一運(yùn)營(yíng)商的互聯(lián)網(wǎng)鏈路，但各條鏈路的帶寬存在差異。 </p> <p> 2. 加權(quán)**少連接（Weighted Least Connection） </p> <p> 實(shí)現(xiàn)機(jī)制－根據(jù)事先為各條鏈路設(shè)定的權(quán)值，在調(diào)度新連接時(shí)盡可能地使各鏈路的已建立連接數(shù)和其權(quán)值成比例，把新的連接請(qǐng)求分配到當(dāng)前比例**小的鏈路上。 </p> <p> 適用場(chǎng)景－各條鏈路的帶寬存在差異，并且不同用戶(hù)發(fā)起的連接保存時(shí)長(zhǎng)差異較大。深信服AD設(shè)備提供有一種稱(chēng)為會(huì)話保持（Session Persistence）的機(jī)制。山西什么是負(fù)載均衡是什么</p><p style="text-indent:25px">快速、智能的應(yīng)用交付網(wǎng)絡(luò)。山西什么是負(fù)載均衡是什么</p><p> 運(yùn)用多臺(tái)服務(wù)器集群的機(jī)制，深信服AD應(yīng)用交付設(shè)備能將所有真實(shí)服務(wù)器配置成虛擬服務(wù)來(lái)實(shí)現(xiàn)負(fù)載均衡，對(duì)外直接發(fā)布一個(gè)虛擬服務(wù)IP。當(dāng)用戶(hù)請(qǐng)求到達(dá)應(yīng)用交付設(shè)備的時(shí)候，根據(jù)預(yù)先設(shè)定的基于多重四、七層負(fù)載均衡算法的調(diào)度策略，能夠合理的將每個(gè)連接快速的分配到相應(yīng)的服務(wù)器，從而合理利用服務(wù)器資源。不僅在減少硬件投資成本情況下解決單臺(tái)服務(wù)器性能瓶頸，同時(shí)方便后續(xù)擴(kuò)容，為大并發(fā)訪問(wèn)量的系統(tǒng)提供性能保障。 </p> <p> 通過(guò)對(duì)服務(wù)器健康狀況的多方位監(jiān)控，深信服AD應(yīng)用交付設(shè)備能實(shí)時(shí)地發(fā)現(xiàn)故障服務(wù)器，并及時(shí)將用戶(hù)的訪問(wèn)請(qǐng)求切換到其他正常服務(wù)器之上，實(shí)現(xiàn)多臺(tái)服務(wù)器之間冗余。從而保證關(guān)鍵應(yīng)用系統(tǒng)的穩(wěn)定性，不會(huì)由于某臺(tái)服務(wù)器故障，造成應(yīng)用系統(tǒng)的局部訪問(wèn)中斷。 </p> <p> 近年來(lái)隨著IPv4地址的逐漸枯竭，以及IPv6對(duì)安全性和可靠性的增強(qiáng)，很多用戶(hù)的網(wǎng)絡(luò)正在逐漸向IPv6過(guò)渡。為了適應(yīng)這種趨勢(shì)，深信服AD應(yīng)用交付設(shè)備不僅能對(duì)IPv4協(xié)議的應(yīng)用系統(tǒng)進(jìn)行負(fù)載均衡，也同樣支持基于IPv6 協(xié)議的L4/L7服務(wù)器負(fù)載均衡，以實(shí)現(xiàn)用戶(hù)對(duì)IPv6服務(wù)的發(fā)布。山西什么是負(fù)載均衡是什么</p><p style="text-indent:25px">上海雪萊信息科技有限公司成立于2019-01-18，專(zhuān)業(yè)從事信息科技、計(jì)算機(jī)科技、數(shù)據(jù)科技、物聯(lián)網(wǎng)科技領(lǐng)域內(nèi)的技術(shù)開(kāi)發(fā)、技術(shù)咨詢(xún)、技術(shù)服務(wù)、技術(shù)轉(zhuǎn)讓?zhuān)W(wǎng)絡(luò)科技，計(jì)算機(jī)信息系統(tǒng)集成，計(jì)算機(jī)服務(wù)，數(shù)據(jù)處理服務(wù)，新興軟件及服務(wù)，大數(shù)據(jù)服務(wù)，計(jì)算機(jī)、軟件及輔助設(shè)備、通訊設(shè)備、電子產(chǎn)品的銷(xiāo)售?！疽婪毥?jīng)批準(zhǔn)的項(xiàng)目，經(jīng)相關(guān)部門(mén)批準(zhǔn)后方可開(kāi)展經(jīng)營(yíng)活動(dòng)】等多項(xiàng)業(yè)務(wù)，主營(yíng)業(yè)務(wù)涵蓋[ "上網(wǎng)行為管理", "下一代防火墻", "VPN", "華為" ]。目前我公司在職員工達(dá)到11~50人人，是一個(gè)有活力有能力有創(chuàng)新精神的高效團(tuán)隊(duì)。誠(chéng)實(shí)、守信是對(duì)企業(yè)的經(jīng)營(yíng)要求，也是我們做人的基本準(zhǔn)則。公司致力于打造***的[ "上網(wǎng)行為管理", "下一代防火墻", "VPN", "華為" ]。目前公司已經(jīng)成為[ "上網(wǎng)行為管理", "下一代防火墻", "VPN", "華為" ]的**企業(yè)，正積蓄著更大的能量，向更廣闊的空間、更***的領(lǐng)域拓展。</p></p><br /><p>文章來(lái)源地址: http://www.cdcfah.com/cp/579268.html</p></div></div></div></div></div><div id="2tpgctf" class="page-right twoColRt"><div id="2b2f4nz" 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