is it possible to do windows failover clustering with non RDM disks now?
Only for "Cluster-in-a-Box" configurations.
see https://pubs.vmware.com/vsphere-65/topic/com.vmware.ICbase/PDF/vsphere-esxi-vcenter-server-65-setup-... (search for RDM)
André
can i do an iscsi connection directly from each vm to the storage?
That should work as long as you configure it in a supported way.
from the above mentioned document:
Use of software iSCSI initiators within guest operating systems configured with MSCS, in any configuration supported by Microsoft, is transparent to ESXi hosts and there is no need for explicit support statements from VMware.
André
what are pros and cons going iscsi connection from guest vs using rdm?