On 3/4/2016 10:34 AM, Murray, Paul (HP Cloud) wrote:
Hi All,
Now that we have passed the feature freeze I thought it was worth giving
a quick update
on where we are with the live migration priority.
The following is a list of work items that have been merged in this
cycle ( for the live migration
sub-team’s working page see
https://etherpad.openstack.org/p/mitaka-live-migration ). There
is also a number of merged and on-going bug fixes that are not listed here.
_Progress reporting_
Provide progress reporting information for on-going live migrations.
·https://blueprints.launchpad.net/nova/+spec/live-migration-progress-report
* https://review.openstack.org/#/q/topic:bp/live-migration-progress-report
__
_Force complete_
Force an on-going live migration to complete by pausing the virtual
machine for the
duration of the migration.
·https://blueprints.launchpad.net/nova/+spec/pause-vm-during-live-migration
·https://review.openstack.org/#/q/topic:bp/pause-vm-during-live-migration
__
_Cancel_
Cancel an on-going live migration.
·https://blueprints.launchpad.net/nova/+spec/abort-live-migration
* https://review.openstack.org/#/q/topic:bp/abort-live-migration
__
_Block live migration with attached volumes_
Enable live migration of VMs with a combination of local and shared storage.
·https://blueprints.launchpad.net/nova/+spec/block-live-migrate-with-attached-volumes
·https://review.openstack.org/#/c/227278
__
_Split networking_
Send live migration traffic over a specified network.
·https://blueprints.launchpad.net/nova/+spec/split-network-plane-for-live-migration
·https://review.openstack.org/#/q/topic:bp/split-network-plane-for-live-migration
__
_Make live migration api friendly_
Remove –disk_over_commit flag and add –block_migration=auto (let nova
determine
how to migrate the disks)
·https://blueprints.launchpad.net/nova/+spec/making-live-migration-api-friendly
* https://review.openstack.org/#/q/topic:bp/making-live-migration-api-friendly
__
_Use request spec_
Add scheduling to live migration and evacuate using original request
spec (includes all
original scheduling properties)
·https://blueprints.launchpad.net/nova/+spec/check-destination-on-migrations
·https://review.openstack.org/#/c/277800/
·https://review.openstack.org/#/c/273104/
_Deprecate migration flags_
Replace the combination of migration configuration flags with a single
tunneled flag.
·(no blueprint)
·https://review.openstack.org/#/q/project:openstack/nova+branch:master+topic:deprecate-migration-flags-config
__
_Objectify live migrate data_
Use the migrate object instead of a dictionary in migration code.
·https://blueprints.launchpad.net/nova/+spec/objectify-live-migrate-data
·https://review.openstack.org/#/q/project:openstack/nova+branch:master+topic:bp/objectify-live-migrate-data
Next steps…
Now we have passed the feature freeze we will be turning attention to
the following
three tasks:
1.Documenting the new features
2.Adding expanding the CI coverage
3.Fixing bugs
The CI job gate-tempest-dsvm-multinode-live-migration was added to the
experimental
queue earlier In the cycle. We now need to add tests to this job to
increase coverage. If
you have any suggestions for CI improvements please contribute them on
this page:
https://etherpad.openstack.org/p/nova-live-migration-CI-ideas
If you can contributed to live migration bug fixing you can look for
things to do here:
https://bugs.launchpad.net/nova/+bugs?field.tag=live-migration
For priority reviews see the live migration section here:
https://etherpad.openstack.org/p/mitaka-nova-priorities-tracking
The live migration sub-team has an IRC meeting on Tuesdays at 14:00 UTC on
#openstack-meeting-3:
https://wiki.openstack.org/wiki/Meetings/NovaLiveMigration
Best regards,
Paul
Paul Murray
Technical Lead, HPE Cloud
Hewlett Packard Enterprise
+44 117 316 2527
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The gate-tempest-dsvm-multinode-full job which runs live migration tests
on nova patches has been non-voting for awhile now. There are at least
two known tracked bugs so we can keep an eye on failure rates.
1. Volume based live migration aborted unexpectedly:
http://status.openstack.org/elastic-recheck/index.html#1524898
2. Libvirt live block migration migration stalls
http://status.openstack.org/elastic-recheck/index.html#1539271
Those are actually the top two failures in the check queue.
The job is bouncing between 25% and ~80% failure rates:
http://tinyurl.com/gvt5h56
At one point that job was relatively stable, it had to have been because
it was voting.
So I'm not sure what's going on, but those should probably be the top
priority bugs for live migration. The problem, unfortunately, could be
something latent in libvirt 1.2.2 or qemu 2.0.0.
I'm not sure what the difference is in failure rates between the
volume-backed and block migration tests, mtreinish might be able to tell
from subunit2sql, but that could be interesting data.
--
Thanks,
Matt Riedemann
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