![]() ![]() To test vSphere HA, turn off the host that is running some virtual machines, after few minutes you will see the virtual machines are restarted in another (secondary) host(s) within the cluster. To view the cluster status, click the cluster object and select the summary tab. Review the host information and click Next. Repeat the same steps to add another host as shown below. You can see the list of VMs being added in the cluster. Under Lockdown Mode, leave the default and click Next. Here, I will choose evaluation mode and click Next. Under Assign License setting, enter the license key. Step 10. View the summary and click Next. Enter username and password of the host and click Next. Here, enter the IP addresses of the host. Right click the cluster object and click Add Host. Step 8. Now simply add the hosts to the cluster object by simply adding the hosts. Step 7. Now review the configuration settings and click Finish. Step 6. Under VM Swapfile location, leave the default and click Next. If you have same processors on all hosts then leave disable and click Next. Step 5. On the VMware EVC tab, you can enable if you have hosts with different processor but with same vendor and same family. Under VM Monitoring, choose VM and Application Monitoring from the drop down. For Host isolation option, choose leave powered on option and click Next. You can set important VMs with higher priority so that it starts earlier than other non-critical VMs. Under Virtual Machine Options, set VM restart priority. ![]() Choose Leave powered on option for Host Isolation response option. You can always come back later here and edit the settings. ![]() Step 3. Under Virtual Machine Options, you can set the restart priority of virtual machines. Here, you can increase or decrease percentage value based upon your scenario. Under Admission Control Policy, choose percentage of cluster resources reserved as failover spare capacity. The vSphere HA Admission Control policy ensures enough resources are available upon failure of any host in the cluster. Similarly, under Admission Control, check Enable: Disallow VM Power on operations that violate availability constraints. Step 2. Under Host Monitoring Status, check Enable Host Monitoring option. Under the cluster feature, check Turn on vSphere HA. Type the name of the cluster, MBG-Cluster. New Cluster wizard will pop up as shown below. Go to Hosts and Clusters view, right-click the virtual datacenter and click New Cluster. Login to vCenter server with vSphere client or web client. Make sure the shared storage is accessible by all the hosts that will be in same cluster.If the application stops sending heartbeats to vCenter server, then the whole virtual machine is rebooted on the same host.Įnough of the basics, now let’s start configuring vSphere HA. Application Failures: – To protect applications, heartbeats are exchanged between the application itself and vCenter server.If vCenter server stops receiving the heartbeats then the VM is restarted on the same host. The VMware tools installed in the guest OS does the heartbeat exchange with vCenter server. Guest OS Failures: – To protect the guest OS failures, the heartbeats are exchanged between the virtual machine and vCenter server.If any hosts of the cluster fails then the virtual machines are restarted in another hosts in the cluster after 30 seconds by default. Host Failures: – To protect virtual machines from host failures, heart beats are exchanged between physical hosts in the vSphere cluster.VMware vSphere HA protects from three types of failures: – The hosts should also have VMkernel network with Management Network check box enabled and static IP address configured. Similarly, the shared storage should also be accessible by all hosts in the cluster. In vSphere HA, the hosts should be in cluster and managed by same vCenter server. In this post, I will show steps to configure VMware vSphere HA in vSphere 5.5 Configure VMware vSphere HA in vSphere 5.5 So configuring HA is one of the important tasks in vSphere infrastructure. VMware vSphere HA protects against host failures, guest OS failures and application failures by restarting the virtual machine in another host within the cluster. VMware vSphere High Availability (HA) feature is used to prevent unplanned downtime that could cause from hardware failure, power outage, etc. ![]()
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