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Bug 694253

Summary: SCSI devices ordered differently between 6.1 snapshot-1 and snapshot-2
Product: Red Hat Enterprise Linux 6 Reporter: Daniel Yeisley <dyeisley>
Component: kernelAssignee: Red Hat Kernel Manager <kernel-mgr>
Status: CLOSED NOTABUG QA Contact: Red Hat Kernel QE team <kernel-qe>
Severity: medium Docs Contact:
Priority: medium    
Version: 6.1CC: mgahagan
Target Milestone: rc   
Target Release: ---   
Hardware: Unspecified   
OS: Linux   
Whiteboard:
Fixed In Version: Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2013-02-26 15:35:08 UTC Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Bug Depends On:    
Bug Blocks: 846704    
Attachments:
Description Flags
dmesg boot log
none
dmesg from kernel-2.6.32-128.el6.x86_64
none
/proc/partitions from kernel-2.6.32-125.el6.x86_64
none
/proc/partitions from kernel-2.6.32-128.el6.x86_64
none
/proc/scsi/scsi from kernel-2.6.32-125.el6.x86_64
none
/proc/scsi/scsi from kernel-2.6.32-128.el6.x86_64 none

Description Daniel Yeisley 2011-04-06 19:42:36 UTC
Created attachment 490370 [details]
dmesg boot log

Description of problem:
I'm seeing sda become sdb when I move from kernel-2.6.32-125.el6.x86_6 to kernel-2.6.32-128.el6.x86_64 on veritas[2,3].rhts.eng.bos.redhat.com.

Version-Release number of selected component (if applicable):
kernel-2.6.32-128.el6.x86_64

How reproducible:
Always

Steps to Reproduce:
1. Install snapshot-1
2. Boot the system and look at /proc/partitions
3. Install kernel-2.6.32-128.el6.x86_64 and reboot
4. Check /proc/partitions again.
Or
1. Install snapshot-2 directly and check /proc/partitions.
  
Actual results:
With kernel-2.6.32-128.el6.x86_64 the megaraid boot device ends up being labeled sdb.  On all previous kernels I've tested it is sda.

Expected results:

Additional info:

Comment 1 Daniel Yeisley 2011-04-06 19:44:27 UTC
Created attachment 490371 [details]
dmesg from kernel-2.6.32-128.el6.x86_64

Comment 2 Daniel Yeisley 2011-04-06 19:50:24 UTC
Created attachment 490373 [details]
/proc/partitions from kernel-2.6.32-125.el6.x86_64

Comment 3 Daniel Yeisley 2011-04-06 19:51:01 UTC
Created attachment 490374 [details]
/proc/partitions from kernel-2.6.32-128.el6.x86_64

Comment 5 RHEL Program Management 2011-04-06 20:03:45 UTC
Since RHEL 6.1 External Beta has begun, and this bug remains
unresolved, it has been rejected as it is not proposed as
exception or blocker.

Red Hat invites you to ask your support representative to
propose this request, if appropriate and relevant, in the
next release of Red Hat Enterprise Linux.

Comment 6 Daniel Yeisley 2011-04-06 20:54:11 UTC
Created attachment 490397 [details]
/proc/scsi/scsi from kernel-2.6.32-125.el6.x86_64

Comment 7 Daniel Yeisley 2011-04-06 20:55:04 UTC
Created attachment 490398 [details]
/proc/scsi/scsi from kernel-2.6.32-128.el6.x86_64

Comment 8 Daniel Yeisley 2011-04-19 19:05:50 UTC
So far I've only seen this on Dell PowerEdge 2850's and nowhere else.  I was able to reproduce it on veritas3.rhts.eng.bos.redhat.com, veritas2.rhts.eng.bos.redhat.com, and dell-pe2850-01.rhts.eng.bos.redhat.com.

Comment 9 RHEL Program Management 2011-10-07 15:29:34 UTC
Since RHEL 6.2 External Beta has begun, and this bug remains
unresolved, it has been rejected as it is not proposed as
exception or blocker.

Red Hat invites you to ask your support representative to
propose this request, if appropriate and relevant, in the
next release of Red Hat Enterprise Linux.

Comment 10 Jes Sorensen 2013-02-26 15:35:08 UTC
SCSI device ordering is not guaranteed