Hi folks. We have 7 p655's with 8 CPU's and 1 p690 with 32 CPU's. These machines are linked with a 1 gigabit, low-latency switch for MPI computations using a switch from IBM called an "SP2 switch", AKA a "Colony switch". We're currently running AIX 5.1. IBM is telling us that AIX 5.3 will never support our SP2 switch, so our upgrade path seems to have disappeared shortly after purchasing the equipment. Is there any possibility of SuSe for pSeries supporting this hardware effectively, especially the SP2 switch (now or in the future)? Would we have to toss the SP2 switch and go with (much higher latency) gigabit ethernet, or myrinet or something for our MPI computations? How's the SMP support on pSeries? Is it up to handling 32 CPU's well yet? One of the reasons the guy with the grant money for this compute cluster wanted AIX, was for the AIX compilers - so I need to ask: Will SuSe for pSeries be able to use xlc/xlC/xlf/xlf90/xlf95 and such? Also, is loadleveler available for SuSe on pSeries? That's the queuing system we're using now, and it's also the queuing system many of the freely redistributable climatology programs we need are written to work with... Thanks!