Hi,
Local disk of one ESXI host will not be able to access by other ESXI host.
I alos use similar setup , Here is my setup in workstation.
1. Two ESXI host in VMware Workstation virtual machine
2. One windows 2008 machine for vCenter server
3. One Open filer applaince ( free ) , using this I creat LUN and map it to ESXi host.
Note : I have enabled software iscsi on ESXI host with vmkernel port group.
Here is KB article to enable software iscsi on ESXI
You can download ope filer from here
http://www.openfiler.com/community/download/
Once you have shared storage then you can do vmotion of storage vmtion of VM.
Hope this will be helpful for you
Regards
Mohammed