Thanks for your reply.
I already knew the documentation article you suggested; my problem is point 5: "Select a device to use for your datastore and click Next".
How do I choose the correct device? Will the wizard show me only the formatted space of the Buffalo storage or do I have to specify it by IP or any other identificator?
Another question about the delete of the actual datastore: Buffalo's Tera-nas-03 (the partition I'd like to reformat) is empty, but is a datastore listed in both my hosts.
It makes no difference which host I select to right click and delete, or do I have to do the procedure for both hosts?
(maybe it's a silly question, but cluster is in production, I have no experience in Vmware and I really want to be careful)
Thanks