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List:       linux-smp
Subject:    Re: IDE tape and SMP
From:       Douglas Ridgway <ridgway () gmcl ! com>
Date:       1998-10-30 0:05:16
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On Thu, 29 Oct 1998, Gadi Oxman wrote:

> The ide-tape + SMP problem reported by Matthew Hunter was that
> after about one hour of backup, the backup process would lock
> in the 'D' state.
> 
> Andre Hedrick and Alex Buell reported seemingly SMP related
> irq timeouts and DSC timeouts.
> 
> I'm not sure whether the second case is SMP related, but I can
> believe that the first is.

I think the problem I see is similar to the second case: 

Oct 24 23:24:35 ursula kernel: hdc: irq timeout: status=0xd8 { Busy }
Oct 24 23:24:36 ursula kernel: hdc: ATAPI reset complete
Oct 24 23:24:36 ursula kernel: ide-tape: ht0: I/O error, pc =  a, key =
6, asc = 29, ascq =  0

and the tar fails with an I/O error.

For me, it happens about half the time while running UP. Under SMP, I
don't think I tried more than a couple of times. 

doug.

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