ONARCHIVE problem : define volume

Hi everybody, I'm trying to define a volume for the back up of the logical logs (on disk). I'm using the following commands : #onarchive 'define/vset=dbs_vop/accessibility=0/device_type=dbs_vop/class=system/driver=disk/permanently_mounted/location=(/opt2/informix_bu/dbs_vop)' #onarchive 'define/vset=logs_vop/accessibility=0/device_type=dbs_vop/class=system/driver=disk/permanently_mounted/location=(/opt2/informix_bu/logs_vop)' #onarchive 'define/volume/vset=dbs_vop/label=1/virtual=(/opt2/informix_bu/dbs_vop/vol1)/max_space=9999999' onarchive 'define/volume/vset=logs_vop/label=1/virtual=(/opt2/informix_bu/logs_vop/vol1)/max_space=9999999' The first three went ok, (also a level 0 back up) but the last one gives the error message : ARC-E-01165, Undefined device (see CONFIGURATION file). config.arc : DEVICE dbs_vop = /opt2/informix_bu/dbs_vop DEVICE logs_vop = /opt2/informix_bu/logs_vop DEVICE tape = /dev/tape DEVICE disk = /tmp onconfig # System Archive Tape Device TAPEDEV /dev/null # Tape device path TAPEBLK 16 # Tape block size (Kbytes) TAPESIZE 4000000 # Maximum amount of data to put on tape (Kbytes) # Log Archive Tape Device LTAPEDEV /dev/tape # Log tape device path LTAPEBLK 16 # Log tape block size (Kbytes) LTAPESIZE 4000000 # Max amount of data to put on log tape (Kbytes) The directories and /dev/tape exists. Any suggestions ? Thank you for your help Siebe