Postmaster already running !!!

Hi,
I am running PostgreSQL version 8.0 in Solaris 8.
I am starting the postmaster when the system is coming up.
I am facing the following problem :
FATAL:  lock file "/data/ALAsm/PGSQL/data/postmaster.pid" already
exists
HINT:  Is another postmaster (PID 448) running in data directory
"/data/ALAsm/PGSQL/data"?
is coming, eventhough postmaster wasn't running and postmaster fail
to start, which makes my system to go down (due to my script).
I have to manually clean up the postmaster.pid from the directory /data/ALAsm/PGSQL/data
(from where I have initialized the database using
initdb and running the postmaster).
Can anyone help what is the problem here ?.
Also, I got another problem.
LOG:  could not bind IPv6 socket: Cannot assign requested address
HINT:  Is another postmaster already running on port 5432? If
not, wait a few seconds and
retry.
LOG:  could not bind socket for statistics collector: Cannot assign
requested address
LOG:  database system was interrupted at 2005-07-21 15:05:15 CDT
LOG:  checkpoint record is at 0/E06260
LOG:  redo record is at 0/E06260; undo record is at 0/0; shutdown
TRUE
LOG:  next transaction ID: 174106; next OID: 25721
LOG:  database system was not properly shut down; automatic recovery
in progress
LOG:  record with zero length at 0/E062A0
LOG:  redo is not required
PANIC:  could not access status of transaction 174106
DETAIL:  could not read from file "/data/ALAsm/PGSQL/data/pg_clog/0000"
at offset 40960: Error 0
LOG:  startup process (PID 501) was terminated by signal 6
LOG:  aborting startup due to startup process failure
After this, postmaster is not running and the system got rebooted continuously.
In this case, I have to manually cleanup all the database and run initdb
again to setup the database.
Can any one help, what is the problem?.
 
Thanks
Siva
 
 
-- 
K.G.Sivaraman, Axes Technologies (I) Pvt Ltd

"The only SERVICE to be done for our lower classes is to give them 
EDUCATION, to develop their lost individuality" - Swami Vivekananda