The management network should be configured with a static IP address and reachable FQDN. The hosts should be running at least ESXi 5.5. The vCenter deployment size should be at least small, and therefore 4 vCPU 16 GB RAM.
After deployment of VCSA 6.5 with embedded PSC, I started HA configuration with the advanced option with different subnets for HA network (private) due to Disaster Recovery Site requirements. When you use das.isolationaddress it often goes hand in hand with das.usedefaultisolationaddress set to false. Configure vCenter 6.5 HA with the Advanced Option. EN-002319-02 n Updated topic ESXi Hardware Requirements, on page 23 to state that, starting with vSphere 6.
Vcenter 6.5 ha requirements windows#
So now what? Well first of all, as mentioned in the comments section as well, vSphere always checks if an isolation address is specified, that could be the default gateway of the management network or it could be the isolation address that you specified through advanced setting das.isolationaddress. EN-002319-03 Updated topic vCenter Server for Windows Requirements, on page 236 to state that the local policy must allow assigning Log on as a batch job rights to new local users. The error witnessed was “This host has no isolation addresses defined as required by vSphere HA” as shown also in the screenshot below. By implementing vCenter HA you can protect your vCenter from host and hardware failures, and significantly reduce down time during patching due to the active / standby nature of the vCenter cluster. The isolation response is not required for 2-node as it is impossible to properly detect an isolation event and vSAN has a mechanism to do exactly what the Isolation Response does: kill the VMs when they are useless. The vCenter Server Appliance now provides vCenter High Availability (HA) with vSphere 6.5 onwards. I had a comment on one of my 2-node vSAN cluster articles that there was an issue with HA when disabling the Isolation Response.
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