Operating System - OpenVMS
cancel
Showing results for 
Search instead for 
Did you mean: 

How tu re-use old DLT tape on a VAX ?

 
SOLVED
Go to solution
Highlighted
Frequent Advisor

How tu re-use old DLT tape on a VAX ?

Hello ,

New to vax admin...

I've a very old vax with a DLT TZxx
I've a lot of old DLT tapes previously used on unix systems.
I would like to reformat (init) for use on the vax but no way.
The vax only accept blank tapes or previoulsy vax formatted tapes.

When I load a old tape; the TZ seems to be looking for a specific header(blank or Vms) and never stop searching for it.

Any help appreciated
Thank.
What could I say ?
22 REPLIES 22
Highlighted
Honored Contributor

Re: How tu re-use old DLT tape on a VAX ?

Maybe the difference is in "very old" vs. "old":
Loading of the cartrige has nothing to do with the content i.e. wether it was software formatted by whatever.

If the drive is unable to load the tape, then the cartrige is incompatible with the drive. Check the particular drive model against the cartrige type: DLT-III, DLT-IV.,...

Once a tape is successfully loaded, VMS can initialize the tape as a VMS volume even if it was unformatted or "Unix" formatted.
http://www.mpp.mpg.de/~huber
Highlighted
Honored Contributor

Re: How tu re-use old DLT tape on a VAX ?

From somwhere a wether came for whether :-)
http://www.mpp.mpg.de/~huber
Highlighted
Honored Contributor

Re: How tu re-use old DLT tape on a VAX ?

Gilles,

It may well be that Joseph gave the full answer.
However, I do recall way back in the time of TK50 and TK70 that those WERE incompatible, once INITed.
We used to rub them with a fairly strong bar magnet, after which they could be reused, also for the other format.

Never did that to DLTs, however. So, no guarantee, but maybe worth a try?

fwiw

Proost.

Have one on me.

jpe
Don't rust yours pelled jacker to fine doll missed aches.
Highlighted
Frequent Advisor

Re: How tu re-use old DLT tape on a VAX ?

Thank you for your help :o)

VAX 4000/300
DLT TZ88
OS VMS 5.5-2

Tapes DLT IV (40/80Gb)
With new tape DLT IV it works fine.

When I try
allocate MKA100
INIT MKA100: label
answer is : not a blank tape

is there a init/force "like" option please ?

What could I say ?
Highlighted
Honored Contributor

Re: How tu re-use old DLT tape on a VAX ?

So in fact it is loading, and the error happens when VMS tries to write.
Now I don't know the particular drive models, but the VMS driver tells You the cartrige can't be written in that density, only READ.

But You have a version of VMS which maybe does not support the DLT drive at all, so it misinterprets the density. I remeber 5.5-2 in a time when only DEC TK70 where available, no later DLTs.

I think You should be able to MOUNT/FOREIGN/NOWRITE the tape, then
do a SHOW DEVICE/FULL of the drive to see what VMS thinks the tape/drive is.
http://www.mpp.mpg.de/~huber
Highlighted
Honored Contributor

Re: How tu re-use old DLT tape on a VAX ?

hi,

try init/over=exp

hth

Highlighted
Honored Contributor

Re: How tu re-use old DLT tape on a VAX ?

...or even init/over=(access,exp)

fwiw

Highlighted
Frequent Advisor

Re: How tu re-use old DLT tape on a VAX ?

Joseph

Gedeon > MOUNT/FOREIGN/NOWRITE G$DLT
%MOUNT-F-FILACCERR, magnetic tape file access is nonblank

Gedeon > show dev/full g$DLT

Magtape GEDEON$MKA100:, device type (Generic SCSI tape), is online, record-
oriented device, file-oriented device, error logging is enabled, controller
supports compaction (compaction disabled).

Error count 2 Operations completed 18437240
Owner process "" Owner UIC [0,0]
Owner process ID 00000000 Dev Prot S:RWED,O:RWED,G:RWED,W:RWED
Reference count 0 Default buffer size 512
Density unknown Format Normal-11

Volume status: no-unload on dismount, beginning-of-tape, odd parity.
What could I say ?
Highlighted
Honored Contributor

Re: How tu re-use old DLT tape on a VAX ?

The system (device driver) can't determine the drive model, just sees a generic SCSI drive.
So as far I see You can only use new cartriges or cartriges written in the "default" density of the drive.
So You really should upgrade VMS version to make full use of much newer hardware.
http://www.mpp.mpg.de/~huber