If you don't have any 64 bit apps, then there is no point in using 64 bit (some of the 64 bit instructions are quite a bit "slower" than their 31/32 bit counterparts).
However, some apps now are being written assuming 64 bit. You can develop them in 64bit on in an guest environment, but to get their full power, you need to run them in an LPAR. And, remember, many apps are being written for 64 bit on something other than a zSeries. In other words, if you are running 31 bit apps only, choose 31 bit guests. If you need 64 bit apps, use 64bit guests. Regards, Jim Linux S/390-zSeries Support, SEEL, IBM Silicon Valley Labs t/l 543-4021, 408-463-4021, [EMAIL PROTECTED] *** Grace Happens *** n
