Re: The number of heartbeat datastores for host is 0, which is less than required: 2

You probably only have local datastores, which are not what HA would require in order for this functionality (datastore heartbeating) to function correctly.

You will either need 2 iSCSI, 2 FC or 2 NFS volumes... Or a combination of any of these, for this functionality to work. If you do not want to use this functionality you can also disable it:

http://www.yellow-bricks.com/2012/04/05/the-number-of-vsphere-ha-heartbeat-datastores-for-this-host-is-1-which-is-less-than-required-2/