Dear Tom,
Thanks for your reply and insight! I much appreciate it. I certainly look
forward to getting off FC6! In the meantime, I did get it to work -
I remembered SELinux protects /home directories especially.
So I moved "postgres" user's home directory from /home/postgres
to /data/postgres, and the WAL rsync works now under SELinux.
Thanks again! Very helpful!
Best,
-at