[CentOS] Release 6?

[nate]

MHR wrote:
> On Thu, Apr 1, 2010 at 9:25 AM, nate <centos at linuxpowered.net> wrote:
>>
>> I *just* finished upgrading to CentOS 5.4 6 days ago.
>>
>
> How many people got trampled in the rush?

You might be surprised how many outages it takes to co-ordinate
such an upgrade in a medium-large environment(and nobody including
me likes to take *everything* down at once though we did have
such an outage a few weeks ago to move a storage array I upgraded
about 30 systems on that day). The fully redundant systems are
easy to upgrade of course but there are lots of systems that are
not fully redundant(and can't be made as such due to application
design).

I tried doing some online upgrades for some of our more important
systems(minus reboot for kernel) but something in the update
wrecked havok on our NFS cluster the systems are very active doing
NFS stuff 24/7. The NFS cluster recovered automatically but each
time it took about 3 hours. I don't know what the upgrade might
of restarted that would of impacted NFS activity. Since the
upgrade there has been no repeats of the issue but during the
upgrade within 30 minutes of upgrading active NFS clients(while
they were doing stuff) caused immediate headaches on the cluster.

I suspect it's the first OS "upgrade" my company has done at
least on linux.  Looking through my inventory of systems these
are getting a bit stale RHEL3/4:

      1 AS release 3 (Taroon Update 3)
      5 AS release 4 (Nahant Update 1)
      6 AS release 4 (Nahant Update 3)
     36 AS release 4 (Nahant Update 4)
      1 AS release 4 (Nahant Update 6)

I don't count RHEL4->CentOS v5 as an upgrade since it is a complete
re-install. For the most part those will get upgraded when
the systems are retired I think.

nate