High Availability Hosting Infrastructure

VMware High Availability

High Availability Hosting Infrastructure

High availability hosting infrastructure is based on VMWare’s High Availability (HA) feature. In this article, we explain High Availability hosting infrastructure in detail.

What is VMware’s High Availability feature?

VMware High Availability (HA) is a part of the VMware Infrastructure 3 virtualization suite. With VMware HA, a virtualized environment does not require dedicated standby hardware and software. This means that if there’s a host failure, VMware HA ensures automatic relocation of such host to a new host, and gets it up and running. As the name suggests, this ensures high availability for your virtualized infrastructure.

How does High Availability operate?

VMware HA ensures constant monitoring of ESXi hosts and virtual machines. This way, any failures of operating systems and hosts are automatically detected.

In the event of an ESXi host failure, the VM is automatically restarted on a separate ESXi host. All this is done without any human involvement.

Likewise, if the operating system were to fail, HA restarts VMs automatically, thereby ensuring full protection for your applications.

What are the uses of VMware High Availability?

VMware High Availability can be used for any application running in a virtualized environment.

Protection for all applications: Traditional high Availability is slightly expensive, and therefore is used only for mission-critical applications that cannot afford to fail. However, VMware HA provides an economical High Availability option, and thus can be used for all applications irrespective of their criticality.

Protection for the entire IT environment: In relation the previous point, traditional high availability solutions are restricted only to specific operating systems. However, given its ease-of-use and cost effectiveness, VMware HA can be used for the entire IT environment.

Features of High Availability Hosting Infrastructure

Scalability: Within a single cluster, VMWare HA supports up to 32 nodes, thus ensuring a highly scalable solution.

Automatic detection of failures: Any failures of the physical server or the operating system are detected automatically. Also, the affected machine is restarted automatically without disrupting business operations.

Timely checking of resources: VA ensures there are enough resources to restart virtual machines in the event of any failures. VA constantly monitors capacity and ensures there’s adequate spare capacity at all times.

Proactive health checks: If there are any abnormal configuration settings in any of the HA clusters, these are detected by VMware HA. The vSphere client interface provides user-friendly reporting of the health status, any potential errors, and recommended corrective actions.

No dependency on external components: VMware HA is not dependent on DNS resolution. This way HA operations are not affected if any external component were to fail.

Easier communication for HA nodes: VMWare HA enables communication of HA nodes in a cluster via the storage subsystem and also over the management network. With increased communication paths, redundancy is improved as well as the health of vSphere host is better monitored.

Easier to use: VMware HA makes it easy to understand error messages, and thereby quickly act upon such messages. In the rare event of any issue with HA, you need to review only one log file, resulting in faster resolution.


As it can be seen, High Availability Hosting Infrastructure has several advantages. IaaS Provider has deployed VMware High Availability in multiple organizations.

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