On Mon, 25 Apr 2011, Troy Dawson wrote:

> On 04/24/2011 08:14 PM, Nicolas Ross wrote:
>> Hi all !
>>
>> I am new to SL... I am a RedHat user since redhat 5 (the old red hat,
>> not rhel5). I had several server running Tao Linux when it was
>> discontinued. I then used CentOS to run my servers. I am happy with
>> those for the moment.
>>
>> We have deployed over the past several month a cluster of 8 nodes
>> running RHEL6 (paid subscriptions), and a backup cluster of 8 nodes is
>> on the way. Now that I needed some EL6 servers for testing and for
>> routers and other purposes, I successfully transformed 3 of my servers
>> from an unsubscribed RHEL6 to SL6, and updated them successfully.
>>
>> Now, I have a question, there are some CentOS 5 servers that I wish to
>> update to SL6. So, I can switch those to SL5, and do an upgrade via the
>> DVD. I would rather do an upgrade rather than a full install.
>> Does sunc a process can be done ?
>
> My default answer is always "Do a fresh install.  You'll thank me
> later."  That's even if you are doing a RHEL5 -> RHEL6.
>
> But, if you are determined, at the DVD boot prompt, hit tab (so that you
> get the boot options) and put "upgradeany" at the end of the line.
>
> You will then be able to follow the upgrade steps.
> http://www.scientificlinux.org/distributions/6x/installing/upgrade-guide-full.html
>
> Note1: I have not tried this with CentOS to SL.  But in theory it should
> work.
>
> Note2: Please remember my first statement.  It's much better to just do
> a fresh install that an upgrade.

Do note that TUV does NOT support upgrading from RHEL5 -> RHEL6 at all.
So there may be many pitfalls with doing a "upgradeany" as it has gotten 
"NO/not much" testing.

-Connie Sieh

>
> Troy
>