I repeated the entire process, and I have a few clarifications.
When I said the db seemed fine after the restore, I was wrong. I could do a
\d on an unlogged table, but when I selected count(*) from any, that
resulted in an error like "could not open file "base/16388/15963587": No
such file or directory". So the database was definitely not happy after the
restore.
Also, I was wrong when I said I "couldn't go back" after the failed upgrade.
I read the output again, and yes I was able to restart 9.1 after renaming
pg_control.old.
Next, I tried dropping and recreating all my UNLOGGED tables, as logged
tables. On my first try, I forgot a few tables, and the pg_upgrade error
this time was:
Linking user relation files
/var/lib/pgsql/9.1/data/base/16389/29807980
error while creating link for relation "pg_toast.pg_toast_15949256_index"
("/var/lib/pgsql/9.1/data/base/16389/29807980" to
"/var/lib/pgsql/9.2/data/base/16434/15949261"): No such file or directory
Failure, exiting
I realized my mistake, and recreated the remaining unlogged tables. After
that the pg_upgrade worked perfectly.
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