Hi
> The old data is in /data/pg24 , can I load this in /data/pg25 and need
> to reinitialize the wal db checkpoint
If you copy the datadir, you have probably moved the problem 1:1 to pg25.
You should use your daily backup from pg24 or fix the issue in pg24.
What do your logs say about the problem on pg24?
CIAO
andreas