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Answer   Bring a Linux window and type uname –a     Linux ott-w265 2.6.18-8.el5PAE #1 SMP Fri Jan 26 14:28:43 EST 2007 i686 i686 i386 GNU/Linux   el5 – Enterprise Linux 5 2.6.18-8 – Kernel version I686 – 32 bit system  If uname –m command returns x86_64 then 64bit system                         RHEL version         Kernel Version                                  5.0                       2.6.18.8                                  5.1                      2.6.18.53                                  5.2                      2.6.18.92                                  5.3                      2.6.18.128                                  5.4                      2.6.18.155 and 2.6.18.164                                  5.5                      2.6.18.194                   Avalanche officially support RHEL 5.1 which is 2.6.18.53 Kernel version          Note: Same command can be used on Solaris and FreeBSD as well