On the host where the shared file system is mounted, check whether you can start and stop each instance. Do this procedure to verify the DB2 installation.
To check if a DB2 instance can start and stop
# su - db2inst1
Attempt to start the instance:
$ db2start
DB2 should start on the partitions in the db2nodes.cfg file. If DB2 does not start, check the error codes.
Assuming that the previous command is successful, stop the instance:
$ db2stop
If the application does not stop correctly on each node, check for configuration errors. Review the DB2 UDB documentation for error codes.
$ db2 create database dbname
$ db2 list database directory