11 2.Implementing VSphere HA 2.uNderstanding vSphere HA Clusters a The vSphere High Availability feature, or more simply, VSphere HA, is designed to provide an automatic restart of the VMs that were running on an ESXi host at the time it became unavailable FIGURE 7.10 Sphere Availability rovides an automatic 田 restart of VMs that were running on an ESXi host when it failed 田 ESXi host 河南中医药大学/阮晓龙/13938213680/htp/cloudxg.hactcm.edu.cn/http:/www5ucwebcn
12 2.Implementing VSphere HA 2.uNderstanding vSphere HA Clusters o vSphere HA primarily targets ESXi host failures, but it can also protect against VM failures and respond to storage connectivity issues. In all cases, VSphere Ha uses a restart of the VM as the mechanism for addressing the detected failure. This means there is a period of downtime when a failure occurs. Unfortunately, you can't calculate the exact duration of the downtime because it is unknown ahead of time how long it will take to boot a Vm or a series of vms a vSphere Ha might not provide the same level of high availability found in other high-availability solutions. when a failover occurs between ESXi hosts as a result of the vSphere HA feature, there is a slight potential for data loss and/or filesystem corruption because the VM was immediately powered off when the server failed and then brought back up minutes later on another server 河南中医药大学/阮晓龙/13938213680/htp/cloudxg.hactcm.edu.cn/http:/www5ucwebcn