>Number:         172
>Category:       kern
>Synopsis:       soft error while rd/wr to scsi-tape stops backup operation
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    gnats-admin (Kernel Bug People)
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sat Mar 19 09:50:01 1994
>Originator:     Hellmuth Michaelis
>Organization:
HCS Hanseatischer Computerservice GmbH
>Release:        NetBSD-current as of March 16th 1994
>Environment:
I486 ISA, NetBSD-current, Cipher ST150-S1

System: NetBSD bert.hcs.de 0.9a BERT#2 i386


>Description:

	This system has a SCSI-1 QIC Streamer Cipher ST150-S1 connected
	to an Adaptec 1542B.

	While reading/writing and a soft error occures, this tape drive
	generates a check condition status and request sense reads a sense
	key of 01h which is a "recoverable error". 

	No data loss occured by the above described procedure.

	This behaviour unhides a bug in the currently used SCSI - driver
	code, in the event of a soft error (while writing with tar), the
	driver/tar writes the following lines to the console and terminates
	operation:

		st0: soft error (corrected)
		st0: error ignored
		tar: only wrote 0 of 10240 bytes to /dev/rst0

	The driver announces the correct behaviour (= to ignore this type
	of error) but the application program terminates.
		
>How-To-Repeat:

	try to write using tar to a scsi-tape drive which alarms the driver
	that a soft error occured.

>Fix:

	Modify the scsi tape driver in such a way, that a soft error
	condition is really ignored.

	This behaviour has been fixed more than a year ago in the original
	version of Julian's driver.


Hope this was filled-out right ...
hellmuth
-- 
Hellmuth Michaelis    HCS Hanseatischer Computerservice GmbH    Hamburg, Europe
              There is a difference between an open mind and a hole in the head
>Audit-Trail:
>Unformatted:



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