Bug 1022018

Summary: multipathd not updating wwid on lun replacement
Product: Red Hat Enterprise Linux 6 Reporter: Jon Magrini <jmagrini>
Component: device-mapper-multipathAssignee: Ben Marzinski <bmarzins>
Status: CLOSED WONTFIX QA Contact: yanfu,wang <yanwang>
Severity: high Docs Contact:
Priority: high    
Version: 6.3CC: acathrow, agk, bmarzins, ccui, dwysocha, heinzm, msnitzer, prajnoha, prockai, yanwang, zkabelac
Target Milestone: rc   
Target Release: ---   
Hardware: x86_64   
OS: Linux   
Whiteboard:
Fixed In Version: Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2014-03-17 19:01:31 UTC Type: Bug
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Bug Depends On:    
Bug Blocks: 1056239    

Comment 3 RHEL Program Management 2013-10-27 08:36:24 UTC 
This request was not resolved in time for the current release.
Red Hat invites you to ask your support representative to
propose this request, if still desired, for consideration in
the next release of Red Hat Enterprise Linux.
Comment 4 Ben Marzinski 2014-03-17 19:01:31 UTC 
Multipath doesn't handle this, and won't in RHEL6, at least.   There's too many corner cases where things could go horribly wrong. That being said, while I don't that you should do this, you could see if running

# service mulitpathd reload

gets you the correct results.  That deals with all the paths at once.

However, multipath is designed around it's devices always having the same wwid, and breaking that assumption is not something you should do.  You must remove the multipath device before changing the wwid of the path devices, for multipath to work correctly.