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Date: Sun, 26 Sep 2004 21:50:35 GMT
From: Holger Kipp <hk@alogis.com>
To: freebsd-gnats-submit@FreeBSD.org
Subject: tagged queueing broken on quantum Atlas10K3
X-Send-Pr-Version: www-2.3

>Number:         72116
>Category:       kern
>Synopsis:       tagged queueing broken on quantum Atlas10K3
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    freebsd-bugs
>State:          closed
>Quarter:        
>Keywords:       
>Date-Required:  
>Class:          update
>Submitter-Id:   current-users
>Arrival-Date:   Sun Sep 26 22:00:39 GMT 2004
>Closed-Date:    Mon Oct 18 15:51:29 GMT 2004
>Last-Modified:  Mon Oct 18 15:51:29 GMT 2004
>Originator:     Holger Kipp
>Release:        4.8-RELEASE-p25
>Organization:
alogis AG
>Environment:
FreeBSD intserv.int1.b.intern 4.8-RELEASE-p25 FreeBSD 4.8-RELEASE-p25 #5: Sun Sep 26 23:12:45 CEST 2004     wartung@intserv.int1.b.intern:/usr/obj/usr/src/sys/B-INTSERV  i386
>Description:
Quantum ATLAS10K3 tagged queueing seems to be broken.

On old ASUS P2B-S I encountered several BDRs and things like that
(that was with FreeBSD 4.2). Updating to 4.8 and switching hardware
except for harddisks gave the following error (U160 Dual Channel LSI):

mpt0: bullet missed in timeout
mpt1: bullet missed in timeout

This is with 3 of the offending disks in vinum raid5.
Initialization and rebuilding of raid had no problems, though -
maybe due to the fact that then a single drive receives only
read xor write commands, reading or writing sequential data.
>How-To-Repeat:
Buy Quantum Atlas 10K III hard disk, use eg within vinum.
>Fix:
add to sys/cam/cam_xpt.c something like

        {
                /*
                 * 74 Gig Atlas III, presumably same problem as the 9G/18G version.
                 * Reported by: Holger Kipp
                 *              <holger.kipp@alogis.com>
                 *
                 * For future reference, the drive with the problem was:
                 * QUANTUM ATLAS10K3_73_WLS 020W
                 */
                { T_DIRECT, SIP_MEDIA_FIXED, quantum, "ATLAS10K3*", "*" },
                /*quirks*/0, /*mintags*/24, /*maxtags*/32
        },

I have not checked if larger values would also work - merely took 
those from my predecessor.
>Release-Note:
>Audit-Trail:

From: "Kipp Holger" <h.kipp@eurowings.com>
To: <freebsd-gnats-submit@FreeBSD.org>
Cc: <hk@alogis.com>
Subject: Re: kern/72116: tagged queueing broken on quantum Atlas10K3
Date: Mon, 18 Oct 2004 13:14:03 +0200

 This is a multi-part message in MIME format.
 
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 Problem solved.
 
 One of the three disks in use (brand new) had a very strange caching
 and therefore timing/performance behaviour during write operations.
 Write performance was 'oscillating' between 0 (zero) and maximum.
 
 Disk will be replaced. Sorry for the noise.
 
 Holger Kipp
 
 
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 charset=3DWindows-1252">
 <META NAME=3D"Generator" CONTENT=3D"MS Exchange Server version =
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 <TITLE>Re: kern/72116: tagged queueing broken on quantum =
 Atlas10K3</TITLE>
 </HEAD>
 <BODY>
 <!-- Converted from text/plain format -->
 
 <P><FONT SIZE=3D2>Problem solved.<BR>
 <BR>
 One of the three disks in use (brand new) had a very strange caching<BR>
 and therefore timing/performance behaviour during write operations.<BR>
 Write performance was 'oscillating' between 0 (zero) and maximum.<BR>
 <BR>
 Disk will be replaced. Sorry for the noise.<BR>
 <BR>
 Holger Kipp<BR>
 </FONT>
 </P>
 
 </BODY>
 </HTML>
 ------_=_NextPart_001_01C4B503.93516C41--
State-Changed-From-To: open->closed 
State-Changed-By: linimon 
State-Changed-When: Mon Oct 18 15:51:06 GMT 2004 
State-Changed-Why:  
Submitter notes problem was hardware-related. 

http://www.freebsd.org/cgi/query-pr.cgi?pr=72116 
>Unformatted:
