Auto Loading tapes in a BRSLA-0203 tape drive

I am not sure why this tape drive will not autoload the next tape after having load/unloaded a tape. The DCL backup would seem to dismount/unload the tape device but the auto-loader does not eject the tape and load the next in sequence.

Any help would be appreciated.

The label shows:
        Regulatory Model:BRSLA-0203
        HP StorageWorks 1/8 Ultrium 960 Tape Autoloader

It takes an Ultrium LTO 3 cartridge # C7973A
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TimPeerConnect With a Mentor Author Commented:
The solution.

The device driver created a pseudo device $1$MIA0: which controls the tape cassette unit. The backup DCL command was mounting $1$MUA0 when it should have been mounting $1$MIA0:. The pseudo-device seems cassette unit seems to perform the allocation of the devices including the loading and unloading of tapes.

Thanks for the suggestions on DCL command usage...

You may want to add/move this into the OpenVMS zone:

nociSoftware EngineerCommented:
The dismount/unload depends on options:

When explicitely used in DISMOUNT that prevails.
Otherwise you can specify what to do with a tape during the MOUNT/UNLOAD or MOUNT/NOUNLOAD command you setup what should happen during dismount of a tape. (For example keep the tape in the drive  even if a command procedure fails to work properly).

Using backup/release_tape on backup also unloads a tape.

Using set volume/unload will also change the default option established at mount time.

DCL II decribes the set command.
DCL I describes the MOUNT/DISMOUNT commands.

Backup can be found in the systems managers essential guide.

nociSoftware EngineerCommented:
Ok MIA0 is a just a different tape unit...
(M stands for MagTape, like D for Disk & T for Terminal)
The second is mostly storage technology: for tapes & disk:  K=Scsi, I=DSSI, U=Unibus
A= First contoller, B=second controller, 0=first unit, 1, second. For scsi the units count in 100's
SCSI id =1 ==> MKA100 for magtape Scsi, first scsi controllerm Scsi Unit 1).
$1$ prefix is the alloclass =1 for this system, otherwise it can bbe nodename$ for cluster devices if alloclass=0.
The unitnumbers can range from 0..9999 or 32768 or 65535 depending on OS version.

Some exceptions do exist. MBAn are mailbox unit. LAT are Lat remote serial ports.
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