George Herson wrote:
> 
> after upgrading to redhat7.1 (from 6.2), my tape drive (/dev/ht0)
> doesn't want to work consistently.  I never see an error on tar
> creation, but the extractions are always flawed.  At best, i'll be able
> to extract some files.  Often i see no errors at the command line (i may
> see "tar: Unexpected EOF in archive"), but in /var/log/messages i see an
> awful lot of: "kernel: ide-tape: Reached idetape_chrdev_open"
> 
This is a debug message I left in after my recent change to ide-tape
so I could help with any problems it may have caused (none so far).

> More from that file:
> Aug  5 23:03:30 localhost kernel: ide-tape: Reached idetape_chrdev_open
> Aug  5 23:03:30 localhost kernel: ide-tape: ht0: I/O error, pc = 10, 
> key =  2, asc = 3a, ascq =  0

This decodes as "Write Filemark","Medium not present"

> Aug  5 23:03:30 localhost kernel: ide-tape: ht0: I/O error, pc = 34,
> key =  2, asc = 3a, ascq =  0

"Read Position","Medium not present"

> Aug  5 23:03:30 localhost kernel: ide-tape: ht0: I/O error, pc =  0,
> key =  2, asc = 3a, ascq =  0

"Test Unit Ready","Medium not present"

> Aug  5 23:03:30 localhost kernel: ide-tape: ht0: drive not ready

And here we have the same result for your next command:

> Aug  5 23:03:30 localhost kernel: ide-tape: Reached idetape_chrdev_open
> Aug  5 23:03:30 localhost kernel: ide-tape: ht0: I/O error, pc = 10, key
> =  2, asc = 3a, ascq =  0
> Aug  5 23:03:30 localhost kernel: ide-tape: ht0: I/O error, pc = 34, key
> =  2, asc = 3a, ascq =  0
> Aug  5 23:03:30 localhost kernel: ide-tape: ht0: I/O error, pc =  0, key
> =  2, asc = 3a, ascq =  0
> Aug  5 23:03:30 localhost kernel: ide-tape: ht0: drive not ready

These two succeed (just ignore the "Reached..." if they're by themselves)

> Aug  5 23:07:01 localhost kernel: ide-tape: Reached idetape_chrdev_open
> Aug  5 23:07:50 localhost kernel: ide-tape: Reached idetape_chrdev_open
> 
> My tar commands can be, for example:
> tar cvvf /dev/ht0 /.bash_history
> tar xvvf /dev/ht0 /.bash_history
> 
> thou thinkest what?
> 
That the log entries you posted do not correlate with reading
from a tape that's actually present in the drive :-(

Thanks, Willem Riede.



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