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Date: Sun, 6 Jul 1997 16:25:25 +0200 (CEST)
From: news@news.LF.net
Reply-To: news
To: FreeBSD-gnats-submit@freebsd.org
Subject: 2940UW, IBM DCAS 32160 -- hungs if ultra speed (40 MB/sec) selected
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>Number:         4039
>Category:       kern
>Synopsis:       2940UW and DCAS 32160 -- hungs if 40 MB/sec is selected and used
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    freebsd-bugs
>State:          closed
>Quarter:        
>Keywords:       
>Date-Required:  
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Sun Jul  6 07:30:00 PDT 1997
>Closed-Date:    Mon May 4 03:47:06 PDT 1998
>Last-Modified:  Mon May  4 03:47:16 PDT 1998
>Originator:     LF.net News Administration
>Release:        FreeBSD 2.2.2-RELEASE i386
>Organization:
LF.net GmbH
>Environment:

	Installed 2.2.2 in a maschine with four DCAS 32160 drives
	on a adaptec 2940UW.

>Description:

	doing a newfs on the second drive while doing I/O will
	cause a system hung (no response, no reboot), if
	40 MB/sec was selected as IO-speed for each SCSI drive
	in the adaptec BIOS. Will hung not always, but very often.

>How-To-Repeat:

	install a complete system on SCSI ID 0.
	do a newfs on SCSI ID 1 or a newfs on the ccd containing
	all of sd1, sd2, sd3.
	The system will hang in most of the cases (responses to ping,
	but not disk IO).

>Fix:
	
	Select 20 MB/sec and it works.
	I will test it soon as a news server, whether it will cope with
	the load.

>Release-Note:
>Audit-Trail:

From: Justin Gibbs <gibbs@plutotech.com>
To: news@FreeBSD.ORG
Cc: FreeBSD-gnats-submit@FreeBSD.ORG
Subject: Re: kern/4039: 2940UW, IBM DCAS 32160 -- hungs if ultra speed (40 MB/sec) selected 
Date: Sun, 06 Jul 1997 10:12:51 -0600

 >	doing a newfs on the second drive while doing I/O will
 >	cause a system hung (no response, no reboot), if
 >	40 MB/sec was selected as IO-speed for each SCSI drive
 >	in the adaptec BIOS. Will hung not always, but very often.
 
 This sounds very much like the buffer deadlock problem that was
 fixed recently in current by Bruce.  My guess is that you are newfsing
 the block device instead of the raw device (which you shouldn't be doing
 anyway) and that the faster I/O speed increases the likelyhood of hitting
 the deadlock.  If you can still reproduce this bug while performing the
 newfs on the raw partition, let me know.
 
 --
 Justin T. Gibbs
 ===========================================
   FreeBSD: Turning PCs into workstations
 ===========================================
State-Changed-From-To: open->closed 
State-Changed-By: phk 
State-Changed-When: Mon May 4 03:47:06 PDT 1998 
State-Changed-Why:  
timed out 
>Unformatted:
