ASM empty directory doesn't get removed, error ORA-15177 The solution is provided in Metalink note ID 444812.1, in short:
either re-create the disk group
- or -
create a dummy tablespace in the directory you are trying to remove and then drop the tablespace, it should also remove the directory
Script to generate sql to enable autoextend on all datafiles SQL> set head off pagesize linesize 200
SQL> select 'alter database datafile ' || '''' || file_name || '''' || ' autoextend on maxsize unlimited;' from dba_data_files where tablespace_name not like 'UNDO%';
