kern/72116: tagged queueing broken on quantum Atlas10K3

[Holger Kipp]

>Number:         72116
>Category:       kern
>Synopsis:       tagged queueing broken on quantum Atlas10K3
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          update
>Submitter-Id:   current-users
>Arrival-Date:   Sun Sep 26 22:00:39 GMT 2004
>Closed-Date:
>Last-Modified:
>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 at 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 at 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:
>Unformatted: