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Date: Wed, 09 May 2001 17:18:09 -0400
From: Mark Bratcher <bratcher@tpr.com>
Organization: Torrey Pines Research
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CC: bratcher@tpr.com
Subject: ATAPI Tape Driver Failure in Kernel 2.4.4, More
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Hi,

I just upgraded from kernel 2.2.17 to 2.4.4. I use a Seagate ATAPI tape drive,
model STT20000A. I use dump to do backups (probably not relevant).

I have more data regarding tape backup failures. Here is what I get:

* In a full tape dump of about 50MB or so, everything goes smoothly. No errors.

* In a full tape dump of a little over 1GB (to a 10GB tape), I get the following
errors
immediately after the backup completes and I try to write a file mark with "mt":

May  9 16:50:49 isaiah kernel: ide-tape: Reached idetape_chrdev_open 
May  9 16:52:05 isaiah kernel: hdd: irq timeout: status=0xd0 { Busy } 
May  9 16:52:05 isaiah kernel: hdd: ATAPI reset complete 
May  9 16:52:05 isaiah kernel: ide-tape: Couldn't write a filemark 
May  9 16:52:06 isaiah kernel: ide-tape: Reached idetape_chrdev_open 
May  9 16:54:06 isaiah kernel: ide-tape: ht0: DSC timeout 
May  9 16:54:06 isaiah kernel: hdd: ATAPI reset complete 
May  9 16:54:06 isaiah kernel: ide-tape: ht0: I/O error, pc = 10, key =  2, asc
=  4,
ascq =  1 
May  9 16:54:06 isaiah kernel: ide-tape: ht0: I/O error, pc = 34, key =  2, asc
=  4,
ascq =  1 

* In a full tape dump of between 6GB and 7GB, the backup completes, I
successfully write a tape file mark with "mt", rewind, then attempt to compare.
I get:

May  9 04:21:18 isaiah kernel: ide-tape: Reached idetape_chrdev_open 
May  9 04:22:35 isaiah kernel: ide-tape: bh == NULL in
idetape_copy_stage_to_user 
May  9 04:22:35 isaiah kernel: ide-tape: bh == NULL in
idetape_copy_stage_to_user 
May  9 04:22:36 isaiah kernel: ide-tape: Reached idetape_chrdev_open 

The errors are repeatable and do not occur in 2.2.17. At this rate, I'll have to
go back to 2.2.17 to get successful backup scripts working.

Anyone know what causes this problem?

Please reply directly, as I'm not a member of this list.

Thanks :-)
Mark Bratcher
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