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Auto Loading tapes in a BRSLA-0203 tape drive

Posted on 2010-09-20
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Last Modified: 2013-12-06
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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Question by:TimPeer
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by:giltjr
ID: 33726936
You may want to add/move this into the OpenVMS zone:

http://www.experts-exchange.com/OS/VMS_OpenVMS/

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by:noci
ID: 33761716
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.
  http://h71000.www7.hp.com/doc/84final/9996/ba555_90007.pdf
DCL I describes the MOUNT/DISMOUNT commands.
  http://h71000.www7.hp.com/doc/84final/9996/ba555_90006.pdf

Backup can be found in the systems managers essential guide.
See:
  http://h71000.www7.hp.com/doc/os84_index.html

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Accepted Solution

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TimPeer earned 0 total points
ID: 33791536
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...

Tim
 
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by:noci
ID: 33792827
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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