10g hangs because of Archiver is unable to archive a redo log because the output device

the most probable option is that there is no place for your archive logs.
If you use flash_recovery_area, increase the size there:

$ sqlplus /nolog

SQL> connect sys as sysdba;
Enter password: 
Connected.
SQL> select * from v$recovery_file_dest;

if SPACE_USED is the same or close to SPACE_LIMIT it's definitely this reason (no place to store archive logs)

increase the size of flash_recovery area:

SQL> alter system set db_recovery_file_dest_size = 50g scope=BOTH;

this will set the size of the flash_recovery_area to 50g immediately, and after restart as well (setting the parameter to SPFILE)

If your database is not opened, try to shut it down first.

SQL> shutdown immediate

if that takes long time then

SQL> shutdown abort
SQL> startup nomount

do the stuff written above

SQL> alter database open;