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Conference turris::digital_unix

Title:DIGITAL UNIX(FORMERLY KNOWN AS DEC OSF/1)
Notice:Welcome to the Digital UNIX Conference
Moderator:SMURF::DENHAM
Created:Thu Mar 16 1995
Last Modified:Fri Jun 06 1997
Last Successful Update:Fri Jun 06 1997
Number of topics:10068
Total number of notes:35879

8565.0. "Xmcd problems on AlphaStation 600 5/266 running D_U 4.0b" by GEMEVN::CSIKESZ () Thu Jan 23 1997 15:35

T.RTitleUserPersonal
Name
DateLines
8565.1SMURF::KNIGHTFred KnightThu Jan 23 1997 16:499
8565.2scu outputGEMEVN::CSIKESZFri Jan 24 1997 10:088
Following your instructions about scu ...

gypsy.zko.dec.com> /sbin/scu
scu> set nexus bus 0 target 5 lun 0
scu: [0/5/0] CAM CCB function 'XPT_GDEV_TYPE' failed,
     CAM status = CAM_DEV_NOT_THERE (0x8) - Device not installed/there
scu: 'get device type' failed, EIO (5) - I/O error
scu>
8565.3It's brokenSMURF::KNIGHTFred KnightFri Jan 24 1997 19:335
Sure looks broken to me.  Make sure the console
can see it (and if it can't, start checking/replacing
cables or the drive itself).

	Fred
8565.4Checking consoleGEMEVN::CSIKESZThu Jan 30 1997 15:439
Fred,

You suggest ..

"Make sure the console can see it, and if it can't ..."

How do I make sure the console can see it?

8565.5netrix.lkg.dec.com::thomasThe Code WarriorThu Jan 30 1997 15:463
>>> show dev

Do you see a RRD??
8565.6Show dev ...GEMEVN::CSIKESZFri Jan 31 1997 18:1715
Did I do what you said correctly?
(I did this as myself and as superuser, as well with the same result).

Does this indicate the problem?

What can I tell my sysadmin to do about it?

Thanks,


gypsy.zko.dec.com> /sbin/scu
scu> show dev
scu: All or part of device nexus information (bus/target/lun) is NOT setup!.
scu>

8565.7at >>>KYOSS1::GREENMon Mar 10 1997 14:374
    	I believe Fred meant to shut down the system and at the >>>
    do "show device" you should see a dev dkxx that says it is a RRD
    device.
    
8565.8Cause of Xmcd problems with 4.0bNNTPD::"[email protected]"Gary FieldFri May 09 1997 14:5921
I have investigated the problem with running xmcd on Digital UNIX 4.x and
found that the cause is a bug in the CAM subsystem introduced in 4.x.
xmcd uses the User Agent SCSI passthrough driver to issue commands to the
CDROM
drive. It does this with the DISABLE AUTOSENSE flag set and this is what
triggers the bug. When a command (like eject) causes a CHECK CONDITION
the SIM queue is frozen. If AUTOSENSE is enabled, the SIM queue unfreeze
command works OK, but with AUTOSENSE DISABLED, no more commands can be
sent to that device until the system is rebooted.

I modified a version of os_dec.c that works around this problem by
not setting the AUTOSENSE DISABLE flag and providing a buffer for the 
sense data.
I can provide this source file to anyone who wants it.
Eventually, the problem will be fixed in the O/S.


Gary


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