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List:       freebsd-hackers
Subject:    No SCSI recovery - yet another gripe
From:       Joe Greco <jgreco () solaria ! sol ! net>
Date:       1996-01-31 23:04:08
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This is the second time this week my news box has frozen with a SCSI error
of some sort on the screen.  This time:

ahc1: target 3, lun0 (sd23) timed out
sd23(aha1:3:0): BUS DEVICE RESET message queued.
ahc1:A:3: no active SCB for reconnecting target - issuing ABORT
SAVED_TCL = 0x30
ahc1: target 3, lun0 (sd23) timed out
_

The SCSI system works GREAT when all is fine and dandy.  However, this sort
of error "recovery" sucks - a panic and reboot is preferable to a dead
freeze.

In all reality I believe it has something to do with the relative
reliability of drive power connectors and the likelihood that all 14 of them
that are on news.sol.net work perfectly is less than 100%...  so I will
tackle the problem from a hardware standpoint, as I believe that the source
is a loose power connection somewhere.  On the other hand, consider this a
plea for the SCSI gods to improve the error handling somehow!  I hear great
games talked on -hackers and all, layered device independent error handling,
etc...  a free beer to the person(s) who implement(s) it.  ;-)

For kicks, I have been known to take a SCSI disk and unplug it from a
Solaris based system while the system is running.  The grace with which it
attempts to deal with the crisis is admirable.  Sometimes the system even
continues to work if I plug the drive back in...  :-)  I don't expect that
anybody has the time or effort to spare to implement error recovery to this
sort of level, but the current "lock'n'hang" is a little too far to the
opposite extreme...  

Thanks and good evening,

... Joe

-------------------------------------------------------------------------------
Joe Greco - Systems Administrator			      jgreco@ns.sol.net
Solaria Public Access UNIX - Milwaukee, WI			   414/342-4847

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