Hello,
i have the same issue but i have
ontap 7.3.6p5
Lun mapped with iscsi to esx 4.1
Windows VM on datastore.
My df output
C2> df -hr /vol/c2_vm_prod1
Filesystem total used avail reserved Mounted on
/vol/c2_vm_prod1/ 2457GB 1313GB 1143GB 0KB
/vol/c2_vm_prod1/ /vol/c2_vm_prod1/.snapshot 614GB 0KB 614GB 0KB /vol/c2_vm_prod1/.snapshot
C2> df -h /vol/c2_vm_prod1
Filesystem total used avail capacity Mounted on
/vol/c2_vm_prod1/ 2457GB 1313GB 1143GB 53%
/vol/c2_vm_prod1/ /vol/c2_vm_prod1/.snapshot 614GB 0KB 614GB 0% /vol/c2_vm_prod1/.snapshot
So on my system manager i have :

have you got an idea ?
Thanks
JC