gistfile1.txt

/usr/lib/postgresql/9.1/bin/pg_upgrade -d /var/lib/postgresql/8.3/main -D /var/lib/postgresql/9.1/main -b /usr/lib/postgresql/8.3/bin -B /usr/lib/postgresql/9.1/bin -k -v
Running in verbose mode
Performing Consistency Checks
-----------------------------
Checking current, bin, and data directories
You must have read and write access in the current directory.
Failure, exiting
postgres@vds2192:/root$ cd /var/lib/postgresql/
postgres@vds2192:~$ /usr/lib/postgresql/9.1/bin/pg_upgrade -d /var/lib/postgresql/8.3/main -D /var/lib/postgresql/9.1/main -b /usr/lib/postgresql/8.3/bin -B /usr/lib/postgresql/9.1/bin -k -v
Running in verbose mode
Performing Consistency Checks
-----------------------------
Checking current, bin, and data directories                 ok

There seems to be a postmaster servicing the new cluster.
Please shutdown that postmaster and try again.
Failure, exiting