On 02/25/2014 10:32 AM, Les Mikesell wrote: > On Tue, Feb 25, 2014 at 12:28 PM, Steve Clark <sclark at netwolves.com> wrote: >> On 02/25/2014 01:17 PM, Fabrizio Di Carlo wrote: >>> Hello to all, >>> >>> currently I have CentOS 6.4 32 bit, very simple setup on my notebook, >>> I want to migrate it from 32 to 64 bits cause I want to play with some >>> VMs etc etc. >>> >>> Do you have some suggestions on how to do backup of folders (mainly I >>> have 1 user) or just copy the user folder and stop? >>> >>> Fabrizio >>> >> Hmmm... we have 32bit CentOS 6.3 running both 32bit and 64bit VirtualBox VMs just fine. > Yes, if you want to use KVM you'd need a 64-bit install, but for > VirtualBox or VMware Player it should only depend on the CPU > capability, not the host OS. While technically true, I can't imagine wanting to do much with VMs without the extra RAM space afforded by 64 bit O/S. Really, 2 (ok, 3) GB of RAM is *not enough* to do serious work. I'd strongly suggest starting with at least 8 GB of RAM. You can do it with the 2 or so that you have, but I wanted to scream with 2 GB using VirtualBox for Windows compatibility testing. 8 GB lets me run a host OS (Fedora) and 2 VMs without too much trouble. 3 VMs starts to slow down noticeably, no matter how I tweak the memory split. -Ben