issues with ide-tape under 2.4.x and with 2.2.x+ide patches

issues with ide-tape under 2.4.x and with 2.2.x+ide patches

[Mike Dresser]

(originally posted to linux-tape@vger, but i figure more people read
this list <grin>)

Hi

Hoping someone can help.  I'm running Debian 2.2, tar (GNU tar)
1.13.17.  Hardware is a celeron 300, Abit BH6, but repeats itself on all
hardware i've tested(old dataexpert 8551/8661's, abit be6, some via686a
box at home, gigabyte mb's, you name it)

I'm currently running 2.4.0test10, running backups onto an IDE HP 7/14
gb drive.  Using  tar -cpvf /dev/ht0 myfiles backs up fine, no errors.

But..

promise:~# tar -tf /dev/ht0
tar: /dev/ht0: Cannot read: Input/output error
tar: At beginning of tape, quitting now
tar: Error is not recoverable: exiting now

and from dmesg:
ide-tape: ht0: I/O error, pc = 1e, key =  5, asc = 20, ascq =  0
ide-tape: ht0: I/O error, pc =  8, key =  5, asc = 2c, ascq =  0
ide-tape: ht0: I/O error, pc = 1e, key =  5, asc = 20, ascq =  0

(normal, i get those cause of the lock drive/unlock drive, which the
drive doesn't support)

If i bounce back to 2.2.17(18-18 as well), and do the exact same
command, I can read my tapes again.  But I lose support for the Promise
Ultra/66 in the machine.  So.  I go back to 2.2.17, put in the ide
patches.  I can't read my tapes again.  Take out the patches.  Tapes
restore fine.  So I'm wondering what changed with Andre's patches, and
also with 2.4.x?

I also ran into the same issues, back when i was playing with 2.2.17,
using taper 6.9b, leading me to suspect it's not tar's fault.  Just
tried dump, aside from it not agreeing with my /dev/md0 device, it backs
up fine, can't restore.

I get the same results with a Seagate IDE 10/20 drive.

ide-tape is compiled as a module, but IIRC it does the same behaviour as
built in.

Yes, the proper solution is buy a DDS-3 drive and a handful of tapes.
But my cheap employer doesn't want to spend the money to do it right.

Hoping for a solution,
Mike Dresser

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Re: issues with ide-tape under 2.4.x and with 2.2.x+ide patches

[Jens Axboe]

On Thu, Nov 02 2000, Mike Dresser wrote:
> I'm currently running 2.4.0test10, running backups onto an IDE HP 7/14
> gb drive.  Using  tar -cpvf /dev/ht0 myfiles backs up fine, no errors.
> 
> But..
> 
> promise:~# tar -tf /dev/ht0
> tar: /dev/ht0: Cannot read: Input/output error
> tar: At beginning of tape, quitting now
> tar: Error is not recoverable: exiting now
> 
> and from dmesg:
> ide-tape: ht0: I/O error, pc = 1e, key =  5, asc = 20, ascq =  0
> ide-tape: ht0: I/O error, pc =  8, key =  5, asc = 2c, ascq =  0
> ide-tape: ht0: I/O error, pc = 1e, key =  5, asc = 20, ascq =  0
> 
> (normal, i get those cause of the lock drive/unlock drive, which the
> drive doesn't support)

Interesting, and this is test10? I submitted a patch for test10 to
not attempt prevent-removal commands in the ide-tape drives that
do not support it. If this is indeed test10, that would mean that
the HP drive misreports that capability. It'd be nice to know.

-- 
* Jens Axboe <axboe@suse.de>
* SuSE Labs
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Re: issues with ide-tape under 2.4.x and with 2.2.x+ide patches

[Mike Dresser]

(forgot to CC: this to the list when i replied to Jens, and decided to add
another paragraph)

I just tried my Seagate drive, and i can read my tapes in it.  If i swap
over to the HP, i can't read the tapes.  I'll look today, whether the
Seagate replies with a bunch of those I/O Errors.  It's not like i'm doing
anything but working on making this damn tape drive work =)

Considering the HP 7/14 gig format is already a proprietory format(<sarcasm>
THANKS HP! </sarcasm>), it wouldn't surprise me if something else is non
standard.  It's weird that i can read 7/14 gig tapes in the 10/20 Seagate
though.  Nice of Seagate to include support for someone else's mistake =)

Jens Axboe wrote:

> On Thu, Nov 02 2000, Mike Dresser wrote:
> > I'm currently running 2.4.0test10, running backups onto an IDE HP 7/14
> > gb drive.  Using  tar -cpvf /dev/ht0 myfiles backs up fine, no errors.
> >
> > But..
> >
> > promise:~# tar -tf /dev/ht0
> > tar: /dev/ht0: Cannot read: Input/output error
> > tar: At beginning of tape, quitting now
> > tar: Error is not recoverable: exiting now
> >
> > and from dmesg:
> > ide-tape: ht0: I/O error, pc = 1e, key =  5, asc = 20, ascq =  0
> > ide-tape: ht0: I/O error, pc =  8, key =  5, asc = 2c, ascq =  0
> > ide-tape: ht0: I/O error, pc = 1e, key =  5, asc = 20, ascq =  0
> >
> > (normal, i get those cause of the lock drive/unlock drive, which the
> > drive doesn't support)
>
> Interesting, and this is test10? I submitted a patch for test10 to
> not attempt prevent-removal commands in the ide-tape drives that
> do not support it. If this is indeed test10, that would mean that
> the HP drive misreports that capability. It'd be nice to know.
>
> --
> * Jens Axboe <axboe@suse.de>
> * SuSE Labs

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Re: issues with ide-tape under 2.4.x and with 2.2.x+ide patches

[Mike Dresser]

> > ide-tape: ht0: I/O error, pc = 1e, key =  5, asc = 20, ascq =  0
> > ide-tape: ht0: I/O error, pc =  8, key =  5, asc = 2c, ascq =  0
> > ide-tape: ht0: I/O error, pc = 1e, key =  5, asc = 20, ascq =  0
> >
> > (normal, i get those cause of the lock drive/unlock drive, which the
> > drive doesn't support)
>
> Interesting, and this is test10? I submitted a patch for test10 to
> not attempt prevent-removal commands in the ide-tape drives that
> do not support it. If this is indeed test10, that would mean that
> the HP drive misreports that capability. It'd be nice to know.

Confirmed.

promise:~/crap# uname -a
Linux promise 2.4.0-test10 #4 Mon Oct 30 17:16:16 EST 2000 i686 unknown

And i think my clock chip is drifting, it's actually the 6th of November. =)

Anyways...... Spent 15 minutes trying to figure out why it couldn't read the
tape, and kept giving me the errors.  Then i remembered the whole point of
this bug-report WAS about it not reading tapes.  It's Monday morning, but my
brain is still out there in the wild blue yonder. :)

I'm interested in why the HP drive won't read tapes, but if i swap in my
Seagate, it reads them just fine.  Well, aside from media errors.  Seems HP
can't build a tape drive OR tape media that is reliable =)


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