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Bug 1286650 - An option to do unsafe live migration of VirtualDomain
Summary: An option to do unsafe live migration of VirtualDomain
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Red Hat Enterprise Linux 6
Classification: Red Hat
Component: resource-agents
Version: 6.8
Hardware: Unspecified
OS: Unspecified
unspecified
medium
Target Milestone: rc
: ---
Assignee: Oyvind Albrigtsen
QA Contact: cluster-qe@redhat.com
URL:
Whiteboard:
Depends On: 1242181
Blocks:
TreeView+ depends on / blocked
 
Reported: 2015-11-30 12:08 UTC by Oyvind Albrigtsen
Modified: 2016-05-10 19:15 UTC (History)
6 users (show)

Fixed In Version: resource-agents-3.9.5-28.el6
Doc Type: Bug Fix
Doc Text:
Clone Of: 1242181
Environment:
Last Closed: 2016-05-10 19:15:38 UTC
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)
Working patch (5.07 KB, patch)
2015-12-01 10:54 UTC, Oyvind Albrigtsen 		no flags Details | Diff
View All


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHBA-2016:0735 0 normal SHIPPED_LIVE resource-agents bug fix and enhancement update 2016-05-10 22:28:24 UTC

Comment 2 Oyvind Albrigtsen 2015-12-01 10:54:35 UTC 
Created attachment 1100831 [details]
Working patch
Comment 3 Oyvind Albrigtsen 2015-12-01 10:55:11 UTC 
Updated patch for RHEL6 and tested and confirmed that it's working.
Comment 4 Oyvind Albrigtsen 2015-12-21 12:29:16 UTC 
Before:
Unable to do live migration when cache mode isnt set to none.

After:
Able to do live migration when cache mode isnt set to none by setting migrate_options="--unsafe"
Comment 5 Oyvind Albrigtsen 2016-01-08 09:54:01 UTC 
# pcs resource create VM VirtualDomain config=/etc/libvirt/qemu/vm.xml migration_transport=ssh meta allow-migrate=true


Before:
# rpm -q resource-agents
resource-agents-3.9.5-24.el6_7.1.x86_64

# pcs resource move VM host2
# tail -f /var/log/cluster/corosync.log
Live migration fails with: Unsafe migration: Migration may lead to data corruption if disks use cache != none


After:
# rpm -q resource-agents
resource-agents-3.9.5-28.el6.x86_64

# pcs resource update VM migrate_options="--unsafe"
# pcs resource move VM host2
# tail -f /var/log/cluster/corosync.log
INFO: vmhost: Starting live migration to host2 (using virsh --connect=qemu:///system --quiet migrate --live --unsafe vmhost qemu+ssh://host2/system ).
INFO: vmhost: live migration to host2 succeeded.
Comment 7 Jaroslav Kortus 2016-04-12 21:06:42 UTC 
without migrate_options:

VirtualDomain(vm)[14290]:	2016/04/12_22:52:09 INFO: rhel6.5: Starting live migration to duck-01 (using virsh --connect=qemu:///system --quiet migrate --live  rhel6.5 qemu+ssh://duck-01/system ).

with migrate_options="--unsafe"
VirtualDomain(vm)[15261]:	2016/04/12_22:54:39 INFO: rhel6.5: Starting live migration to duck-01 (using virsh --connect=qemu:///system --quiet migrate --live --unsafe rhel6.5 qemu+ssh://duck-01/system ).

The domain migrated successfully.

Thing to add here:
* if GFS2 is used that migration is already considered safe and --unsafe is not needed (same applies to OCFS, SMB and NFS shares and perhaps others).

Verified with resource-agents-3.9.5-34.el6.x86_64.
Comment 9 errata-xmlrpc 2016-05-10 19:15:38 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, 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://rhn.redhat.com/errata/RHBA-2016-0735.html
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