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Bug 2087916

Summary: RHV Warm migration fails if VM has 2 disks
Product: Migration Toolkit for Virtualization Reporter: Igor Braginsky <ibragins>
Component: ControllerAssignee: Matthew Arnold <marnold>
Status: CLOSED ERRATA QA Contact: Igor Braginsky <ibragins>
Severity: urgent Docs Contact: Richard Hoch <rhoch>
Priority: unspecified    
Version: 2.3.1CC: fbladilo, istein, jortel, marnold, mguetta
Target Milestone: ---   
Target Release: 2.3.2   
Hardware: Unspecified   
OS: Unspecified   
Whiteboard: regression
Fixed In Version: Doc Type: If docs needed, set a value
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Story Points: ---
Clone Of: Environment:
Last Closed: 2022-07-21 13:48:39 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:
Embargoed:
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Description Flags
Imported log pod none

Description Igor Braginsky 2022-05-18 14:24:18 UTC 
Created attachment 1880920 [details]
Imported log pod

Created attachment 1880920 [details]
Imported log pod

Created attachment 1880920 [details]
Imported log pod

Created attachment 1880920 [details]
Imported log pod

Description of problem: Warm migration from RHV fails if a RHEL8 VM has 2 disks, both when target storage is CEPH and NFS.
Incremental copy is created successfully, but after starting cutover - process fails

Version-Release number of selected component (if applicable): 
OCP-4.11.0
CNV-4.11.0
MTV 2.3.1

How reproducible: 100%

Steps to Reproduce:
1. Create new warm plan
2. Select VM with 2 disks
3. Select target storage as CEPH or NFS
Important: Source VM should run during migration process, otherwise bug will not reproduce!

Actual results:
1. Migration plan is stuck in progress
2. CNV UI shows that VM has Data volume error
3. Importer pod is in CrashLoopBack state, see the log attached

Expected results:
VM should be migrated as usual

Additional info:
1. Warm migration of a VM with 2 disks from VMware PASSED for both NFS and Ceph target.
2. Warm migration of a VM with 1 disk from RHV PASSED for both NFS and Ceph target
3. Cold migration of a VM with 2 disks from RHV PASSED for Ceph target
Comment 1 Ilanit Stein 2022-05-27 06:06:18 UTC 
Matthew Arnold:

"This bug was always there, it's just kind of unusual to hit. 
It happens when a snapshot's Actual Size is bigger than its Virtual Size

Work around - It looks like expanding the source disk should work, it's kind of an annoying workaround though.
But as long as the Virtual Size is bigger than the Actual Size, you shouldn't hit this bug.
Also, it might also help to create the second disk starting at something bigger than 1GB."
Comment 2 Igor Braginsky 2022-06-29 15:32:48 UTC 
Verified this bug on MTV 2.3.2-7/iib:261342. VM migration was successful and VM looks good after migration was completed
Comment 5 errata-xmlrpc 2022-07-21 13:48:39 UTC 
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory (MTV 2.3.2 Images), and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2022:5679