Once new hosts has joined to existing VMware cluster and configure iSCSi vSwitch & vmKernel, go to storage adapters > iSCSi Software Adapter > copy iSCSI Name

Go to Storage management > Servers > Add New Server

Paste the iSCSi Name into Manually Add HBA > Click OK

Next, select new servers > Add to Cluster to move the new add server into existing cluster

Select which cluster to join

Go to System > Ports > check storage controller VIP which is Fault Domain 1 & 2 IP

Back to VMware cluster > New Host > Storage Adapters > iSCSi Software Adapter > Dynamic Discovery > Add both Fault Domain 1 & 2 VIP

Next go to Network Port Binding > add both iSCSi vmkernel to blind the volume

Once added, go to VMware cluster > Select New hosts and run Rescan Storage

To verify storage is mounted to the new hosts, select new host > Datastores

or go to Storage > select any datastore from the cluster you wanted to join > Configure > check on Connectivity and Multipathing, if the new hosts show under this option meaning the storage is mounted

Done!