Bug 462844

Summary: Changeable SCSI Disk Boot Messages
Product: Red Hat Enterprise Linux 4 Reporter: Qian Cai <qcai>
Component: kernelAssignee: Red Hat Kernel Manager <kernel-mgr>
Status: CLOSED DEFERRED QA Contact: Martin Jenner <mjenner>
Severity: medium Docs Contact:
Priority: medium    
Version: 4.7.zCC: dhoward, duck, vmayatsk
Target Milestone: rc   
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: Doc Type: Bug Fix
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Clone Of: Environment:
Last Closed: 2009-05-01 16:13:14 UTC Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Embargoed:

Description Qian Cai 2008-09-19 10:40:59 UTC 
Description of problem:
Sometimes, I have seen SCSI disk boot messages have been changed among different boots with the same Kernel,

http://rhts.redhat.com/testlogs/29361/106777/912439
(diff-dmesg.2.6.9-78.0.4.EL)

 SCSI device sdc: drive cache: write through
  sdc: sdc1
 Attached scsi disk sdc at scsi0, channel 0, id 2, lun 0
-  Vendor: IBM       Model: 26K4888a S320  1  Rev: 1   
+  Vendor: SDR       Model: GEM318P           Rev: 1   
   Type:   Processor                          ANSI SCSI revision: 02
 Fusion MPT SAS Host driver 3.12.19.00rh
 libata version 2.00 loaded.


Version-Release number of selected component (if applicable):
kernel-2.6.9-78.0.4.EL

How reproducible:
occasionally (1 in 10 boots?)
Comment 1 Qian Cai 2008-09-19 12:38:55 UTC 
Don't know if this is a regression, but I could not reproduce the issue for RHEL 4.6 GA Kernel (2.6.9-78.EL) for rebooting around 20 times.
Comment 2 Qian Cai 2008-09-22 01:41:25 UTC 
I could reproduce it with kernel-2.6.9-78.0.3.EL. Let me run it for a longer period to see if it is there since RHEL 4.7.
Comment 3 Qian Cai 2008-10-22 12:39:10 UTC 
Any idea on why would these information would change? Is it because there are two disks in the controller, and one of them has been picked up randomly?
Comment 4 Vitaly Mayatskikh 2009-03-16 14:06:05 UTC 
We need to know full h/w configuration for SCSI bus, may be there is some kind of collision. I'll ask RHTS admins.
Comment 5 Qian Cai 2009-05-01 16:13:14 UTC 
The machine iin question (groucho.rhts.bos.redhat.com) is broken at the moment.
https://engineering.redhat.com/rt3/Ticket/Display.html?id=29276

I'll close this out for now, and I can reopen this if have seen another occurrence in the future.