Chris, i think it does not depend weather the filespace *is* unicode, it depends on the unicode client.
see following APAR from Tivoli web. herfried APAR= PQ54549 SER= IN INCORROUT ANS1357S WHEN CONNECTING WITH NON-UNICODE CLIENT Status: CLOSED Closed: 11/08/01 Apar Information: RCOMP= 5698TSMVS TIV 390 STORAGE RREL= R421 FCOMP= 5698TSMVS TIV 390 STORAGE PFREL= F999 TREL= T SRLS: NONE Return Codes: Applicable Component Level/SU: R421 PSY UP Error Description: Once a unicode TSM client (V4.2.0 or higher Windows NT/2000 or V4.2.1.15 or higher Windows XP client) has been used to connect to a TSM V4.2 server with a given node name, that node name can no longer be used by a non-unicode TSM client. If you attempt to connect with that node name using a non-unicode TSM client, you will receive the following error:
