[openstack-dev] [nova] Live migrations: Post-Copy and Auto-Converge features research

Koniszewski, Pawel pawel.koniszewski at intel.com
Tue Nov 8 07:53:33 UTC 2016

Adding operators list, as it might be interesting for them. Please note that some of tested options are not available in nova, i.e., XBZRLE and postcopy-after-precopy. Regarding postcopy, nova automatically decides whether live migration should be switched to postcopy mode (only if live_migration_permit_post_copy is set to True, by default it is set to False), postcopy-after-precopy is an internal virsh command which is not exposed through the libvirt API.

Kind Regards,
Pawel Koniszewski

From: Vlad Nykytiuk [mailto:vnykytiuk at mirantis.com]
Sent: Monday, November 7, 2016 9:35 PM
To: openstack-dev at lists.openstack.org
Subject: [openstack-dev] [nova] Live migrations: Post-Copy and Auto-Converge features research


As you may know, currently QEMU supports several features that help live migrations to operate more predictively. These features are: auto-converge and post-copy.
I made a research on performance characteristics of these two features, you can find it by the following link:

Hope you find it helpful.


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