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Tape Library

admin1979
Super Advisor

Tape Library


Hello,


Hello,

We have a working MSL5000 series tape connected to TRU64 system (V5.1 alpha).
I am not able to access the tapes via /dev/ntape/tape4_d0 so I used /dev/ntape/tape4_d1 and I could access it.
Is there any sort of difference if we access the tape via d1 instead of d0 ?? What are these for that matter ,

file /dev/ntape/*

/dev/ntape/tape4: character special (19/885) SCSI #9 "DLT8000" tape #35 (SCSI ID #4) (SCSI LUN #3) errors = 0/7 offline
/dev/ntape/tape4_d0: character special (19/889) SCSI #9 "DLT8000" tape #35 (SCSI ID #4) (SCSI LUN #3) errors = 0/7 offline
/dev/ntape/tape4_d1: character special (19/891) SCSI #9 "DLT8000" tape #35 (SCSI ID #4) (SCSI LUN #3) errors = 0/7 offline
/dev/ntape/tape4_d2: character special (19/893) SCSI #9 "DLT8000" tape #35 (SCSI ID #4) (SCSI LUN #3) errors = 0/7 offline
/dev/ntape/tape4_d3: character special (19/895) SCSI #9 "DLT8000" tape #35 (SCSI ID #4) (SCSI LUN #3) errors = 0/7 offline
/dev/ntape/tape4_d4: character special (19/897) SCSI #9 "DLT8000" tape #35 (SCSI ID #4) (SCSI LUN #3) errors = 0/7 offline
/dev/ntape/tape4_d5: character special (19/899) SCSI #9 "DLT8000" tape #35 (SCSI ID #4) (SCSI LUN #3) errors = 0/7 offline
/dev/ntape/tape4_d6: character special (19/901) SCSI #9 "DLT8000" tape #35 (SCSI ID #4) (SCSI LUN #3) errors = 0/7 offline
/dev/ntape/tape4_d7: character special (19/903) SCSI #9 "DLT8000" tape #35 (SCSI ID #4) (SCSI LUN #3) errors = 0/7 offline
/dev/ntape/tape4c: character special (19/887) SCSI #9 "DLT8000" tape #35 (SCSI ID #4) (SCSI LUN #3) errors = 0/7 offline


Please suggest.
admin
3 REPLIES
Victor Semaska_3
Esteemed Contributor

Re: Tape Library

From 'man tape':

__________________________________________
Previous Format in /dev New Formats in /dev/tape and /dev/ntape
____________________________________________
rmt?a tape?_d3
rmt?l tape?_d0 (d0 always maps to the low density)
rmt?m tape?_d2
rmt?h tape?_d1 (d1 always maps to the high density)
____________________________________________

also,

DensityNumber = 1,2
tape?_d1, or tape?_d2. In this case, compression is set to On (0x1)
There are 10 kinds of people, one that understands binary and one that doesn't.
Rob Leadbeater
Honored Contributor

Re: Tape Library

Hi,

Victor has answered the question, however can you expand on "...not able to access..." ? What are the exact commands that you're using ?

If tape4_d0 is unusable, then I would also expect tape4_d1 to be unusable.

Cheers,

Rob
admin1979
Super Advisor

Re: Tape Library


By not able to access means,

>mt -f /dev/ntape/tape4_d0 online
/dev/ntape/tape4_d0 online 1 failed: I/O error

>mt -f /dev/ntape/tape4 _d0 online online 1 online
>{and the Tape is online}

Plz let me know if you need anything extra.