shutting down and starting up again an 11g database

For the purpose of cloning/virtualization (VMWARE) an 11g database we want to be sure that the database state gets preserved and nothing gets screwed through the virtualization process and thus I thought to shutdown the database.
I did the following:


SQL> connect / as sysdba
Connect durchgef³hrt.
SQL> shutdown normal;
ORA-01109: Datenbank nicht ge÷ffnet


Datenbank dismounted.
ORACLE-Instanz heruntergefahren.
SQL> startup normal
SP2-0714: Ung³ltige Kombination von STARTUP-Optionen
SQL> startup
ORACLE-Instanz hochgefahren.

Total System Global Area  535662592 bytes
Fixed Size                  1375792 bytes
Variable Size             327156176 bytes
Database Buffers          201326592 bytes
Redo Buffers                5804032 bytes
Datenbank mounted.
ORA-00600: Interner Fehlercode, Argumente: [kcratr_nab_less_than_odr], [1],