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From Chip Childers <chip.child...@sungard.com>
Subject Re: A question on vm migrations when hosts are set into a maintenance mode.
Date Tue, 24 Sep 2013 15:58:07 GMT
Hey Kelven - This topic was discussed briefly in the past [1].  Are you
able to provide any thoughts on Alex's ideas below?

-chip


[1] http://markmail.org/message/fznrszaswruvlmuy



On Tue, Sep 24, 2013 at 10:53:04AM -0500, Alex Ough wrote:
> For a resolution without breaking possible flows, I'd like to add the value
> of 'executeInSequence' to the global setting.
> Is there any reason not to do this?
> 
> Thanks
> Alex Ough
> 
> 
> On Mon, Sep 23, 2013 at 12:57 PM, Alex Ough <alex.ough@sungard.com> wrote:
> 
> > All,
> >
> > 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
> > '/cloudstack/core/src/com/cloud/agent/api/MigrateCommand.java'
> >
> > 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.
> > Thanks
> > Alex Ough
> >
> >
> > On Wed, Sep 18, 2013 at 10:22 AM, Alex Ough <alex.ough@sungard.com> 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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