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From Alex Ough <>
Subject Re: A question on vm migrations when hosts are set into a maintenance mode.
Date Mon, 23 Sep 2013 17:57:35 GMT

After a little more investigation, I found that the 'MigrateCommand'
defined its 'executeInSequence' method to return 'FALSE', which seems to
make the vm migrations as serial even if the migration requests are
dispatched to ha_worker in parallel.
You can confirm this in line 56 of

So my question is if there is any reason why the method have been
defined to return 'FALSE' always?
And do we expect any side effects and/or malfunctioning if we change it to
returning 'TRUE'?

Any answers/comments will be very appreciated.
Alex Ough

On Wed, Sep 18, 2013 at 10:22 AM, Alex Ough <> wrote:

> I checked the vm migration when their host is set to a maintenance mode
> and found that even if the orchestration layer fires the each vm migration
> at the same time using a ha_worker thread, the actual migration seems to be
> executed serially.
> Is this what we expect? And if so, any chance to make the actual
> migrations in parallel?
> Thanks
> Alex Ough

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