Hi Could someone explain how access to LTO tape drives is handled by TSM 4.1 (on a AIX server) in a SAN environment ?? Library Sharing is an option but this feature is only available for NT and SUN servers, isn't it !!!!!!?? How can we prevent TSM clients using drives already in use by other clients ?? And how can we prevent non-TSM clients/applications using drives in use by TSM clients ?? thanks in advance Ruud van Ruler, Shell Services International BV - ISES/31 Our Central Data Storage Management home page: http://sww2.shell.com/cdsm/ > Room 1B/G01 > Dokter van Zeelandstraat 1, 2285 BD Leidschendam NL Tel : +31 (0)70 - 3034644, Fax 4011, Mobile +31 (0)6-55127646 Email Internet: [EMAIL PROTECTED] [EMAIL PROTECTED] R.vanRuler