[CentOS] MIgrate/Upgrade from Centos 5.4 32bit to Centos 5.4 64bit

Oliver Schulze L. oliver at samera.com.py
Thu Jan 7 20:31:35 UTC 2010

Thanks all for the help.

I will boot in rescue mode, then rename all directories, install the 
64bit version
and then restore all the files.

I have been upgrading this server in redhat 4.2 i386, so this time there 
is a need
for platform upgrade also.

It has been a long way from a P2 to a Core2Duo Quad ;)

Oliver Schulze L.

El 05/01/10 17:09, Robert Heller escribió:
> At Tue, 5 Jan 2010 11:26:32 -0800 CentOS mailing list<centos at centos.org>  wrote:
>> On Tue, Jan 5, 2010 at 11:24 AM, MHR<mhullrich at gmail.com>  wrote:
>>> On Tue, Jan 5, 2010 at 7:46 AM, Oliver Schulze L.<oliver at samera.com.py>  wrote:
>>>> Hi,
>>>> It is posible to do a simple procedure to upgrade a Centos 5.4 32bits
>>>> (i686) to
>>>> a Centos 5.4 64bits(x32_64)?
>>>> I was thinking about an upgrade or install without formating.
>>>> I will have a current backup before doing it.
>>>> Any advice/tips is welcome.
>>> I *strongly* doubt it.  When you go from 32 to 64 bit systems, you are
>>> essentially replacing the kernel and (at least) about 90% of the
>>> standard libraries.  I am willing to bet that this mandates an
>>> installation.
>>> For the record, I've never tried it.  When I put CentOS on my machine,
>>> I already had a 64-bit CPU and I never seriously considered NOT using
>>> the 64-bit install.
>>> HTH.
>>> mhr
>> Sorry - PS:  IIRC, you don't _have_ to format your disks to install
>> over what's on them - check the installation options when you get that
>> far and read through them carefully.  You should be able to re-use
>> existing partitions, but I can't remember whether that *requires*
>> reformatting them - I've just always done that (reformat them).
> You really should/ought to reformat /, /usr, and /var.  /boot and /home
> don't need to be reformated (leaving /boot alone allows for multi-OS
> version booting, eg CentOS 4 and CentOS 5 or Ubuntu and CentOS or CentOS
> and Fedora, etc.).  The installer will be unhappy about NOT reformatting
> /, /usr, or /var.  It will warn about not reformatting /boot -- this is
> generally OK though.  It will NOT complain about not reformatting /home
> or any other random non-system file system you might have (I do things
> like have a dedicated /mp3s file system on my laptop for example).
> Unlike the *default* file system setup, which only creates /boot and /
> file systems, it is *strongly* recomended to instead create separate
> /boot, /, and /home file systems (at least these three -- separating
> out /usr and/or /var might make sense under some situations, esp.
> servers) -- this allows updates, multi-OS, and recovery without having
> to make an explicit backup (although, having backups is still
> recomended!).
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