Pg 8.3.x on RHEL 6.3?

Fellow Pg Admins,

At $work, we're preparing to move one of our Pg instances to new
hardware, and considering an OS upgrade at the same time. The
instance in question is running an older version of 8.3, which we'd
like to upgrade to 8.3.latest (presently .21; unf., we don't have the
time or testing resources to migrate to a more recent major release of
postgres as well).

In preparation for that effort, I've been asked to avail myself of the
collective experience and wisdom of the wider community to see if
anyone has seen anything unexpected, or any kind of misbehavior in
running 8.3 on RHEL 6.3. None of my research suggests we should have
any problems, but for sake of due diligence and checking the box, I'm
soliciting any input anyone with experience with this configuration
might be able to offer. We aren't doing anything that would subject
us to the referential_constraints issue, fixed in 8.3.17.

Can we expect to see any benefit from the llseek kernel changes with
8.3, or is the upside of that more limited to people also running 9.2?

Thanks.

rls

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:wq