超融合平臺(tái)競(jìng)爭分析-Nutanix與vSAN

1、超融合平臺(tái)競(jìng)爭分析Nutanix 與 vSAN無意鼓吹”我們是最好”世界不是非黑既白更好的理解和掌握競(jìng)爭情景“知己知彼，百戰(zhàn)不殆；不知彼而知己，一勝一負(fù)；不知彼，不知己，每戰(zhàn)必殆” (孫子, 戰(zhàn)爭的藝術(shù))基因決定格局8321664?架構(gòu)和設(shè)計(jì)決定成敗VSAN的視野核心的設(shè)計(jì)目標(biāo):利用軟件在工業(yè)標(biāo)準(zhǔn)服務(wù)器加本地磁盤的方式提供像SAN存儲(chǔ)一樣的能力主要聚焦的問題: 傳統(tǒng)存儲(chǔ)的高成本避免存儲(chǔ)控制器的瓶頸大規(guī)模擴(kuò)展狹隘的遠(yuǎn)景某些傳統(tǒng)架構(gòu)問題仍然被繼承 Web-Scale Engineering A Different ApproachDesign GoalsFractional consumption

2、 and predictable scaleNo single point of failureDistributed everythingAlways-on systemsExtensive automation and rich analyticsFundamental AssumptionsUnbranded x86 servers: fail-fast systemsNo special purpose appliancesAll intelligence and services in softwareLinear, predictable scale-out遠(yuǎn)景決定能力vSAN架構(gòu)

3、上的局限性vSAN 工作在內(nèi)核模式無法隔離虛擬化層從存儲(chǔ)服務(wù)存儲(chǔ)的問題導(dǎo)致虛擬化層故障功能升級(jí)需要遷移虛擬機(jī)和重新啟動(dòng)虛擬化層 -(增加業(yè)務(wù)風(fēng)險(xiǎn)和額外的管理負(fù)擔(dān)）無數(shù)據(jù)本地化能力無數(shù)據(jù)分層 SSD僅僅提供讀寫緩存單個(gè)虛擬機(jī)不能使用超過自身節(jié)點(diǎn)外的SSD寫緩存最大只能600 GB，嚴(yán)重浪費(fèi)SSD容量和性能保證 默認(rèn)配置，VMDK沒有條帶化配置(IOPS 僅僅來之2個(gè)物理磁盤)數(shù)據(jù)重建只能從1個(gè)主機(jī)和1個(gè)磁盤進(jìn)行，群集規(guī)模大小對(duì)重建沒有意義數(shù)據(jù)重建都需要到SSD，即使是冷數(shù)據(jù)(SSD容易溢出)在三個(gè)節(jié)點(diǎn)配置下，如果有節(jié)點(diǎn)故障，系統(tǒng)不會(huì)重建數(shù)據(jù)vSAN架構(gòu)上的局限性駁斥VSANVSAN存儲(chǔ)服務(wù)嵌入在

4、Hypervisor內(nèi)核中將會(huì)帶來非常嚴(yán)重的后果：完全被vSphere綁定，將會(huì)導(dǎo)致很多額外的軟件成本沒有隔離性，VSAN本身就不成熟，存在很多bug，任何一點(diǎn)bug將可能導(dǎo)致整個(gè)vSphere內(nèi)核崩潰，更進(jìn)一步導(dǎo)致VSAN集群所有節(jié)點(diǎn)連鎖崩潰，從而導(dǎo)致整個(gè)集群所有虛機(jī)宕機(jī)，甚至導(dǎo)致生產(chǎn)數(shù)據(jù)丟失即使你不使用VSAN，嵌入vSphere內(nèi)核的任何VSAN bug仍然將可能導(dǎo)致vSphere內(nèi)核崩潰，生產(chǎn)宕機(jī)無法單獨(dú)對(duì)VSAN進(jìn)行升級(jí)，必須綁死vSphere一起升級(jí)，升級(jí)復(fù)雜，風(fēng)險(xiǎn)巨大，架構(gòu)僵化VSAN存儲(chǔ)服務(wù)嵌入在Hypervisor內(nèi)核中將導(dǎo)致vSphere軟件膨脹臃腫，效率低下，其實(shí)是“最大

5、化” VSAN缺乏關(guān)鍵技術(shù)數(shù)據(jù)本地化，導(dǎo)致VSAN I/O性能極不穩(wěn)定，曲線劇烈抖動(dòng)，性能好不好取決是否碰巧命中本地緩存熱數(shù)據(jù)；由于其數(shù)據(jù)訪問需要頻繁占用網(wǎng)絡(luò)，將會(huì)導(dǎo)致網(wǎng)絡(luò)阻塞，延時(shí)增加，性能下降。VSAN的管理仍然是傳統(tǒng)的C/S管理架構(gòu)，需要通過vCenter來實(shí)現(xiàn)，管理端在架構(gòu)上就不是分布式的架構(gòu)，存在設(shè)計(jì)上的單點(diǎn)故障風(fēng)險(xiǎn)，并且管理復(fù)雜，無法實(shí)現(xiàn)一鍵式升級(jí)，一鍵式擴(kuò)容，一鍵式故障診斷，一鍵式容量規(guī)劃和趨勢(shì)分析等等。Nutanix 控制器虛機(jī)CVM占用4個(gè)CPU核和16GB內(nèi)存，以3000系列舉例，資源滿配占比CPU為11%，內(nèi)存為1.5%；而VSAN如果要實(shí)現(xiàn)完整的功能將要增加一大堆額外的

6、功能虛機(jī)，比如vCenter、VUM、vROM、vSphere Replication、vSphere Data Protection、vSphere Web Client、Platform Services Controller (PSC) 、database platform，等等，其額外的資源占用比例將遠(yuǎn)遠(yuǎn)高于Nutanix。Nutanix 控制器虛機(jī)CVM和Hypervisor分開，實(shí)現(xiàn)：更好的Hypervisor無關(guān)性，可以根據(jù)業(yè)務(wù)需求選擇最合適的Hypervisor，如AHV，Hyper-V，XenServer， ESXi更好的隔離性，任何CVM的故障都不會(huì)影響到Hyperviso

7、r和虛機(jī)的正常運(yùn)行更好的管理性，可以單獨(dú)升級(jí)Nutanix，持續(xù)獲得最新的功能和性能提升I/O性能的好壞取決于底層存儲(chǔ)如何處理讀寫落盤，如何實(shí)現(xiàn)算法的優(yōu)化，如何提供先進(jìn)的企業(yè)級(jí)數(shù)據(jù)服務(wù)功能來優(yōu)化，如何實(shí)現(xiàn)真正的分布式和Web-Scale。Nutanix 的CVM控制器是直通（Passthrough）底層SSD和HDD的，Nutanix擁有業(yè)界最成熟最先進(jìn)的算法的數(shù)據(jù)服務(wù)功能，真正實(shí)現(xiàn)底層架構(gòu)的Web-Scale。如上述，Nutanix 架構(gòu)為業(yè)界最成熟最先進(jìn)的架構(gòu)設(shè)計(jì)，提供最佳的隔離性，安全性，可管理性和擴(kuò)展性。VSAN自愈系統(tǒng) vs 救火式系統(tǒng)Common HDD/SSD Failure S

8、cenariosHDD Failure puts RAID group in degraded stateAdmin needs to deal with drive failureHDD rebuild is traditional RAID = slowSignificant performance impact during rebuildSSD Failure takes out entire disk groupSelf-healing systemFault isolation with distributed recoverySSD or HDD Failure = offlin

9、e driveParity rebuilt throughout clusterLarger the cluster, faster the recoveryTypically min rather than hours/daysDont need to replace drive until capacity needed = no fire drillSSD/HDD replacement adds capacity back to the clusterVSAN 消重和壓縮的限制無全局的消重?zé)o顆粒度1MB 4k Perf Hit on HDD 僅僅在全閃提供虛擬化層缺乏存儲(chǔ)感知的困惑VA

10、AIvStorage APIs for Array IntegrationvSphere APIs for Storage AwarenessVASASPBMStorage Policy Based Management沒有任何關(guān)注情況下如何革新?云平臺(tái)交付的能力Nutanix已經(jīng)具備了云平臺(tái)的交付能力，而非簡單HCI出廠安全設(shè)置 / 自我修復(fù)合規(guī)功能跨Hypervisor災(zāi)難恢復(fù) / 遷移自助服務(wù)配置門戶OpenStack集成支持混合云 (AWS, Azure)可伸縮 / 多站點(diǎn)管理提供運(yùn)行分析與分析預(yù)測(cè)文件與塊服務(wù)應(yīng)用自動(dòng)交付站點(diǎn)容災(zāi)HypervisorESXiAHVNutanix AMF

11、/DSF/DRPrismvSAN 管理VUM存儲(chǔ)/容災(zāi)vROpsvRACvCentervRA Director第三方 NuCalm應(yīng)用交付SRM通過參數(shù)指標(biāo)提高競(jìng)爭門檻Whats new in 6.6?Native encryption for data-at-rest Compliance certificationsvSAN Proactive Drive HA for failing drives Resilient management independent of vCenterRapid recovery with smart, efficient rebuildsCertifie

12、d file service & data protection solutions Stretched clusters with local failure protection 1-click witness change for Stretched ClustervSAN Management Pack for vRealizeEnhanced vSAN SDK and PowerCLISimple networking with Unicast vSAN Cloud Analytics for performance vSAN Cloud Analytics with real-ti

13、me support notification and recommendationsvSAN Config Assist with 1-click hardware lifecycle management Extended Health ServicesvSAN Guided install with 1-click fixesUp to 50% greater IOPS for all-flash with optimized checksum and dedupeSupport for new next-gen workloadsSupport for Photon 1.1Optimi

14、zed for latest flash technologies (announced support for Intel Optane 3D Xpoint based SSDs)Expanded caching tier choice New Docker Volume DriverWhats new in AOS 5.1?Add All-Flash NX Nodes to Clusters Containing Hybrid NodesVMware vSphere 6.5 and vCenter 6.5 support XenServer support (NX-1065-G5/NX-3

15、060-G5/NX-3175-G5 / NX-3175-G5 with NVIDIA M60)1-Click Controller VM Memory Upgrade 1-Click Centralized Upgrades from Prism Central-AOSPost-Process Compression-DefaultPulse Enabled for Prism Central-which provides cluster diagnostic system data to Nutanix support teams, has now been extended to Pris

16、m Central.Erasure Coding Space Savings ImprovementHot Plugging Memory and CPU on Virtual Machines (AHV) -SSPDocker Container Management Through the Self-Service portal Admin Access to Controller VMMetro Availability and synchronous replication are now supported across different hardware vendors (NX, Dell, or Lenovo)Integration with Network Functions in AHV(Tech Preview Features)- run network function virtual machines such as software load balancers and firewallsGPU Pass-