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Problem with initdb and two versions on one server?

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Hello all,
    Because of issues with dump/restore, I am instead setting up a
second cluster under a newer version so I can slowly migrate data (I
have 7.4.30, and am adding 8.3.18 on the same box). The problem is
that when I try to start the new postmaster it complains:

"FATAL:  database files are incompatible with server"
"DETAIL: The data directory was initialised by PostgreSQL version 7.4,
which is not compatible with this version 8.3.18."

I compiled 8.3.18 from source, with the following flags in the configure:
1. --prefix=/backup/pgsql8
2. I did NOT use --disable-rpath (i.e., I wanted shared library paths
baked into the executable so it would look first into
/backup/pgsql8/lib first, assuming that the library differences would
be too great between 7.4 and 8.3)
3. --with-pgport=3005 (the existing one is on the standard port)

I configured, compiled, and installed, and saw the various subfolders
appear under /backup/pgsql8 as expected.

I created the data directory and chown'd it to my superuser.

I ran initdb like so:
/backup/pgsql8/bin/initdb –E UTF8 --locale=en_US -D /backup/pgsql8/data

I assumed by using the full path to the new initdb that the data
directory would be initialised in 8.3.18 style. It ran without errors.

When I run pg_ctl, I use the full path:
/backup/pgsql8/bin/pg_ctl -D /backup/pgsql8/data -o “-p 3005” start

But I still get the error.

I am confused. I feel that I have pointed to 8.3 everywhere, yet
somehow the existing 7.4 is involved. I am not sure if the message is
saying:
1. "Your postmaster is 8.3, but you're pointed at the old data
directory" (despite my -D flag)
or
2. "Your data directory is 8.3, but your postmaster is the old 7.4"
(despite my fully-qualified call to pg_ctl)

Thoughts?

Thanks for helping a newbie,
Chris

PS: Yeah, I know /backup ain't the place to put my database. But the
partitions weren't set up right at the beginning, so this is my hack
for now since I ran out of space.

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