uname -a on my RHEL 5.4 machine is:
Linux <machine name> 2.6.18-164.el5 #1 SMP Tue Aug 18 15:51:48 EDT 2009 x86_64 x86_64 x86_64 GNU/Linux
Does it mean that hardware is 64 bit (going by perhaps first x86_64) and OS is also 64-bit going by last x86_64?
Also, what are these so many instances of x86_64?
Can I install 64-bit vm over 32-bit OS and vice versa?