[Pacemaker] Two virtual machines start when they fail in "Live migration".

[Yuusuke IIDA]

Hi, Andrew

Thank you for an reply.
When a multiplex virtual machine is started in my environment, a disk may be 
broken.
This is fatal.
Because there is no help for it, I intend to apply it in "allow_migrate=false".

Thanks,
Yuusuke IIDA

(2011/02/14 17:38), Andrew Beekhof wrote:
> On Mon, Feb 14, 2011 at 4:04 AM, Yuusuke IIDA
> <iidayuus at intellilink.co.jp>  wrote:
>> Hi, Andrew
>>
>> (2011/02/09 23:55), Andrew Beekhof wrote:
>>>
>>> 2011/2/7 Yuusuke IIDA<iidayuus at intellilink.co.jp>:
>>>>
>>>> Hi,
>>>>
>>>> I am going to manage the virtual machine in environment of
>>>> Pacemaker-1.0.10.
>>>>
>>>> However, the problem that two virtual machines are started occurs when a
>>>> transition graph of "Live Migration" was canceled on the way.
>>>>
>>>> I show a procedure to generate below a problem.
>>>>
>>>> 1. I was going to let you do "Live Migration" of a virtual machine from
>>>> host 1
>>>> to host 2.
>>>>
>>>> 2. In the middle of "Live Migration", monitor by pingd broke down with
>>>> host 2,
>>>> and an attribute changed.
>>>>
>>>> 3. A virtual machine is done start of with host 3 by the management of
>>>> the cluster.
>>>> Because the virtual machine which moved in migrate_to with host 1 then
>>>> works, I
>>>> am in a condition that two virtual machines start.
>>>>
>>>> This phenomenon thinks that it is revised in Pacemaker-1.1.
>>>
>>> I'm not at all surprised that the 1.1 behavior was better, we put a
>>> lot of work into it recently.
>>>
>>>> If this phenomenon is a bug, I want you to revise it in Pacemaker-1.0.
>>>
>>> The necessary patch is quite large and invasive, I don't feel its
>>> appropriate to backport into 1.0.
>>
>> Will it be not to be able to recommend it in pacemaker-1.0 to move a
>> resource by setting of "allow_migrate=true"?
>
> Well you can set that and if the RA doesn't fail everything will be happy.
> But as you saw, the recovery characteristics if/when part of the
> migration fails are not ideal.
>
> _______________________________________________
> Pacemaker mailing list: Pacemaker at oss.clusterlabs.org
> http://oss.clusterlabs.org/mailman/listinfo/pacemaker
>
> Project Home: http://www.clusterlabs.org
> Getting started: http://www.clusterlabs.org/doc/Cluster_from_Scratch.pdf
> Bugs: http://developerbugs.linux-foundation.org/enter_bug.cgi?product=Pacemaker
>

-- 
----------------------------------------
METRO SYSTEMS CO., LTD

Yuusuke Iida
Mail: iidayuus at intellilink.co.jp
----------------------------------------