Article 166434 of comp.os.vms: On the underside of the tape unit, there should be some option switches 1-8. Set 1 to ON, 2 to OFF. This sets the drive to use compression at power on with no host control. HETFELD@WEEEV3.UNI-WUPPERTAL.DE (Andreas Hetfeld) wrote: ->Hi everybody, -> ->I've got the following problem with a HPC1533A device: -> ->we use this device to backup a 4 GB harddisk on a 90 meter tape on a openvms v6.2 node. ->Meanwhile the disk has about 2 GB used and the backup-command fails with the following ->error message: -> ->$ backup /noassist - -> /image - -> /ignore=interlock - -> /list=mgr_bck_lis:vaxbck970225.lis - -> user0: - -> vax_backup:vaxbck970225.bck - -> /media=compaction - -> /label=VAXBCK ->%BACKUP-I-RESUME, resuming operation on volume 2 ->%MOUNT-I-OPRQST, Please mount volume VAXB02 in device _WEEEV5$MKA400: ->BACKUP requests: Saveset VAXBCK970225.BCK, Volume number 02, write ENABLED ->%MOUNT-F-BATCHNOOPR, no operator available to service batch request -> ->So I think there is no free space left on the tape. The HP-DAT is able to store ->about 4 GB on a 90 meter tape using a hardware compression, so I wonder why ->there's no more free space. -> ->Here's the information about the DAT-device: -> ->$ show dev VAXDAT /full -> ->Magtape WEEEV5$MKA400:, device type HP C1533A, is online, file-oriented device, -> error logging is enabled, controller supports compaction (compaction -> disabled). -> -> Error count 0 Operations completed 0 -> Owner process "" Owner UIC [SYSTEM] -> Owner process ID 00000000 Dev Prot S:RWPL,O:RWPL,G:R,W -> Reference count 0 Default buffer size 2048 -> Density unknown Format Normal-11 -> -> Volume status: no-unload on dismount, position lost, odd parity. -> ->As shown in this info the controller of the device supports compaction, but the ->compaction is disabled! How can I enable compaction, or is there another reason ->why the DAT isn't able to store more than about 2 GB? -> ->Greetings from Wuppertal, Germany -> -> A. Hetfeld -> ->-- ->------------------------------------------------------------------------------ -> $HOME $WORK ->Andreas Hetfeld Lehrstuhl fuer Elektrische Energieversorgung ->Am Koehler 12 A Bergische Universitaet Wuppertal ->42349 Wuppertal Fuhlrottstrasse 10 ->Germany 42097 Wuppertal -> Germany ->Tel: +49(0)202 402771 Tel: +49(0)202 439-3021 -> Fax: +49(0)202 439-2977 -> ->email: hetfeld@weeevc.uni-wuppertal.de ->web: http://www.eev.uni-wuppertal.de/~hetfeld/welcome.html ->------------------------------------------------------------------------------