If think, on FAS6000 (except 6210 & 6040) ... if you have 64-bit aggr then the max limit is 100TB. Including snap reserve and disk overhead space. Not that you can't, but just curious to know, why would you setup such a huge LUN (that to iSCSI) for production environment? Unless this will be provisioned as QA or Dev or something else.
Thanks,
Nisar