https://4sysops.com/archives/vmware-high-availability-ha-cluster-ha-configuration/
vSphere requirements ^
Before I discuss the final configuration steps, I want to recap what’s necessary to activate the HA successfully:
- A minimum of two hosts in the cluster – You can have up to 64 hosts in vSphere cluster.
- Shared Storage – Every server that is part of the HA cluster needs to have access to at least one shared storage.
- Network – You must connect all hosts to at least one management network. The VMkernel network with the Management Networkcheckbox has to be enabled; by default, the HA needs an accessible default gateway.
- Licensing – All hosts must have licenses for HA. HA won’t work with an ESXi free license. You need at least vSphere Essentials.
- VMware tools – It is highly recommended that you install VMware tools on all hosts, and it is required if you want to work with the VM monitoring feature.
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