ORA-01157 and ORA-01110 troubleshooting

When the tablespace is expanded in the field, the environment is: solaris 10 cluster 3.2 + Oracle 10g RAC after expansion, execute sqlplus/as sysdba and then query the table space:

SQL> select file_name from dba_data_files;

The following error message is displayed:

ORA-01157: cannot identify/lock data file 10-see DBWR trace file

ORA-01110: data file 12: '/dev/md/oradg/rdsk/d123"

This is because the owner of the bare device files of the two instances is inconsistent. After checking the owner of the bare device files on each node and changing it to normal, after an abnormal instance is restarted, the problem is solved.