silversurfer972 at gmail
Jul 12, 2012, 9:01 AM
Post #1 of 1
[nova] Live Migration + Ephemeral disk impossible with qcow2 format
I noticed a bug in Multiple OpenStack Clusters that prevent instances with
ephemeral disk to be migrated when qcow2 format is used.
The bug has need fixed here
<https://bugs.launchpad.net/nova/+bug/977007>but the fix has been
committed to the head branch for Folsom.
Live migration is a very important feature to production clouds as it
allows maintenance with 0 downtime. Even is ephemeral disk is not a best
practice, the fact that it is included in defaults profile make it more
relevant as soon-to-be-fixed bug.
I would like to know if it is planned to have the bug fixed also on Essex
Then a bug fix upgrade in ubuntu 12.04 OpenStack repository would be the
I would be unfortunate to have this bug on Essex with users forced to patch
between each package upgrade.
To manually fix the bug:
vim +2168 /usr/lib/python2.7/dist-packages/nova/virt/libvirt/connection.py
Testing works fine while migration is impossible on
version 2012.1+stable~20120612-3ee026e-0ubuntu1.2 on ubuntu 12.04
This bug prevent live migration with ephemeral images with qcow2 images and
needs to be ported to essex asap.
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