I am not sure if you have already answered it and I have somehow missed it: - Are these 'a' and 'b' on two different servers? ( I think they are on different servers) - Did you stop the server on 'b' before you replaced the files and attempted a startup?
> thanks. it doesn't help. i also tried pg_ctl without luck ( http://www.postgresql.org/docs/9.3/static/app-pg-ctl.html). What exact pg_ctl command you used? Regards Sameer