On 06/25/2014 07:42 PM, Nico Kadel-Garcia wrote:
> On Wed, Jun 25, 2014 at 1:13 PM, Lamar Owen <[log in to unmask]> wrote:
>> Yes, it will work partially. To make the switchover complete you need 
>> to do a 'yum distro-sync full' afterwards. While I agree that a 
>> reinstall is cleaner, that isn't a direct answer to your question. 
> You also have to re-install *every single package*, especially those
> that may have minor, uncertain differences between the two
> repositories. It can be done, I've done it between CentOS and RHEL and
> back several times on the same environment.

This is what 'yum distro-sync' is supposed to do (distro-sync full works 
based on the package checksums, and is supposed to reinstall every 
single package that has a different checksum than the currently 
pointed-to repos).  If it does not do it properly, it's a bug that needs 
to be filed against the upstream yum.

> It's a very expensive process in terms of system resources and local
> bandwidth.

It is that (In my case the new repos were on iSCSI SAN and the process, 
while still taking quite a while, completed smoothly on all three Altix 
systems on which I tried it).