How to force a bus reset?

[Randy Gobbel]

On  8-Jan-99 at 03:19, Osma Ahvenlampi (oa at spray.fi) wrote:
> I'm experiencing serious problems using a DDS-3 DAT drive on a Dell
> PowerEdge 2300 (AIC 7890/7860, tape drive on the narrow
> bus). Apparently as an end-of-tape is detected, the drive goes crazy
> and any command sent to it (save for the status command issued by 'mt
> status') will result in an error. My log from last night is filled
> with this:
> 
> Jan  8 09:45:03 safir kernel: Additional sense indicates Internal target
> failure Jan  8 09:45:06 safir kernel: st0: Error with sense data: Current
> error st09:00: sense key Hardware Error 
> 
> Real hardware error is pretty much ruled out, since the drive was just 
> replaced because of this (I guess the old one wasn't broken after
> all).
> 
> I can't even begin to try to figure this one out. But if I knew how to 
> force a device/bus reset, I might see if the drive recovers..
> 
> Driver version is 5.1.4.

Funny, I think I sent a message with the same subject to this list about a
month ago, because my tape drive was doing the same thing.  As can be seen from
the other messages from tape drive owners, many different types of
sequential-access devices are having problems--so there's definitely a bug in
that version of the aic7xxx driver.  The driver in kernel 2.2.0-pre4 was at
version 5.1.7, don't know what's in 2.2.0-pre5.  I had heard that there were
some changes post-5.1.4 that should address problems with tape drives, but I
haven't yet managed to build a 2.2.0-preanything kernel that will boot on my
system, so haven't had a chance to try it.  Has anyone seen any improvements in
tape drive operation with these newer drivers?

-Randy


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