64bit or 32bit?

I would advise against 64bit linux unless you want to spend time finding fixes for library problems at various turns. It's probably fine for a raw linux install, but when you start building your own perl and such (which cPanel likes to do) it starts unravelling and you end up having to install 32bit libraries and binaries anyway. You're unlikely to see much of a performance boost either since the vast majority of the linux code has been written for the 32bit environment and simply recompiled for 64bit. Until apps have been specifically coded to take advantage of 64bit addressing, there seems little point in giving yourself a headache and I'd suggest staying with 32bit.

 

Hey 50C.

I have been using CentOS 3.6 64bit version on a Dual Opteron machine and also the 32bit version on a Dual Xeon machine.

Both machines have round an about the same load. The Dual Opteron performes better sometimes but that is mostly because Opteron vs Xeon and not because of 64bit vs 32bit.

Also most CPanel stuff is written for 32bit so it will have no advantage using 64bit unless you (or CPanel) writes/modifies the scripts for 64bit.

Therefor in my experience I would just recommend the 32bit version.

 

stick with 32-bit

 

Well, we had a lot of bugs including apache/php/zend/I/O-problems/Glibc's but we handled them all and now we're merging all 64bit boxes into production env. and turning all 32bits to that, just waiting for cPanel to officialy support apache 2.0/2.2 to complete the remaining simple memory allocation issues, may be we're a little brave but we'r keeping an eye on things as much as we can to take the most from 64bits.

 

What would you do with so big power eaters ?

I think high performace maschines only good for special applications like
graphic, video and DVD-ripping and so on.