The grid is too, but for all I know some of it may run under XEN or some other emulation, so I suppose it could be SL4 under something else.
It usually is SLC4 under SLC4 too (at CERN we added RHEL5 Xen to SLC4) ;-) Jarek __ ------------------------------------------------------- _ Jaroslaw_Polok ___________________ CERN - IT/FIO/LA _ _ http://home.cern.ch/~jpolok ___ tel_+41_22_767_1834 _ _____________________________________ +41_78_792_0795 _