Hi
in this case you need something like a virtual appliance which uses your local storage to turn it into a shared storage. Your hosts then can access the storage via iSCSI/NFS. In the end you will have the space of one node left(~5.46 TB), because the appliance(s) will mirror your data to be safe against host failures.
Probably the easiest way would be the vSphere Storage Appliance
But there are also others solutions like a virtual DataCore setup or HP StoreVirtual VSA.
Regards
Patrick