Help:AIX/Oracle 8.1.5 "database cannot be mounted"

Fellow Oracle'rs:

I migrated from a 8.0.5 database to 8.1.5 in an AIX 4.3.3.0 server.

The installation of new components, migration and the configuration of Net8 (listener) came as a "Successful".

The instance starts OK, but at the end of the ./dbstart, comes with "....... ORA-01102: database cannot be mounted in EXCLUSIVE mode...... svgmgr> spool off; "

If I do:

sql> ALTER DATABASE myinstancename MOUNT

will come with the same error-message (ORA-01102).

Any pointers about how to track down this problem, any config/init files to look, or an alternate procedure to mount the database will be greatly appreciated.

Thanks a million.

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