6 1. Introducing 1.uNderstanding the Layers of High Availability a Each of these technologies or techniques has its own strengths and weaknesses. For example providing redundancy at the Physical layer is great, but it doesn 't help with failures at the Application layer m Conversely, protecting against application failures wont help much if the underlying hardware isn 't redundant a As you set forth to establish high availability for your virtualized workloads, keep in mind that there is no "one size fits all "solution Use the right tool for the job based on your specific requirements 河南中医药大学/阮晓龙/13938213680/htp/cloudxg.hactcm.edu.cn/http:/www5ucwebcn
1. Introducing 1.uNderstanding the Layers of High Availability o On VSphere, four key technologies or techniques that help provide high availability OS clustering in Microsoft Windows m ESXi host clustering using v Sphere hA a Virtual machine(VM)mirroring using vSphere FT VSAN stretched storage clustering 河南中医药大学/阮晓龙/13938213680/htp/cloudxg.hactcm.edu.cn/http:/www5ucwebcn
8 1. Introducing 1.2Clustering VA a Because Windows Server is widely used in corporate and enterprise datacenters today, it's quite likely that you've been asked to create or support a Windows-based cluster a There are two primary ways to use clustering to provide hig availability for Windows Server Network Load Balancing(NLB)clustering Windows Server Failover Clustering(WSFC) 河南中医药大学/阮晓龙/13938213680/htp/cloudxg.hactcm.edu.cn/http:/www5ucwebcn
9 1. Introducing 1.2Clustering VA FIGURE 7. 2 An nlb cluster can contain up to 32 active nodes(only 5 are shown here), and traffic is 田田田田田 distributed equally across each available VM1 VM2 VM3 VM4 VMs node. The nlb software allows the nodes to share a Loadbalancedidentitywww.rainpole.local(10.1.1.10) common name and Ip address that is reference ed by clients 河南中医药大学/阮晓龙/13938213680/htp/cloudxg.hactcm.edu.cn/http:/www5ucwebcn
0 1. Introducing 1.2Clustering VA FIGURE 7.3 Public network Server clusters are best Shared identity: sql. rainpole local (10.1.1.20) suited for applica tions and services like SQL Server, DHCP and so on, which use a common dataset Private(heartbeat) network Shared 河南中医药大学/阮晓龙/13938213680/htp/cloudxg.hactcm.edu.cn/http:/www5ucwebcn