On Wed, Apr 17, 2013 at 01:29:18PM -0400, Tom Lane wrote:
> Bruce Momjian <br...@momjian.us> writes:
> > Uh, not sure how pg_upgrade would detect that as the version number is
> > not stored in pg_controldata, e.g.:
> >     Data page checksums:                  enabled/disabled
> That seems pretty shortsighted.  The field probably ought to be defined
> as containing a checksum algorithm ID number, not a boolean.
> But having said that, I'm not sure why this would be pg_upgrade's
> problem.  By definition, we do not want pg_upgrade running around
> looking at individual data pages.  Therefore, whatever we might do
> about checksum algorithm changes would have to be something that can be
> managed on-the-fly by the newer server.

Well, my idea was that pg_upgrade would allow upgrades from old clusters
with the same checksum algorithm version, but not non-matching ones. 
This would allow the checksum algorithm to be changed and force
pg_upgrade to fail.

  Bruce Momjian  <br...@momjian.us>        http://momjian.us
  EnterpriseDB                             http://enterprisedb.com

  + It's impossible for everything to be true. +

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