[Pacemaker] Live migration with order constraints

[Andreas Kurz]

On 11/10/2011 03:45 PM, Dejan Muhamedagic wrote:
> Hi,
> 
> On Thu, Nov 10, 2011 at 01:01:12PM +0100, Andreas Kurz wrote:
>> On 11/10/2011 12:48 PM, Dmitry Golubev wrote:
>>> Hi,
>>>
>>>>> I am trying to make a live migration of virtual machines (custom resource
>>>>> agent). The idea is to suspend the virtual machine on one node, remount a
>>>>> filesystem (on top of DRBD) on another node and resume the virtual machine.
>>>>
>>>> May I ask: Why? There is already the VirtualDomain RA which works fine,
>>>> including live migration.
>>>
>>> Because from what I gather, VirtualDomain RA works only with virsh (KVM/Xen),
>>> but I need OpenVZ. The second reason is that I have groups of virtual machines
>>> that work on the same filesystem. There is no way to get this working with
>>> VirtualDomain RA, especially given the next point:
>>
>> Then OpenVE RA might fit.
> 
> Actually, it's called ManageVE. Well, I wonder what else an RA
> could do other than manage :->

ah, yes .. ManageVE ... thx ;-)

Regards,
Andreas

> 
> Thanks,
> 
> Dejan
> 
>>>> Yes, migration only works without order-contraints the migrating service
>>>> depends on ... and no way to force it.
>>>
>>>> Use existing, working and tested RAs.
>>>
>>> Well, then I will need to hack unfortunately :( I hope it is possible for a
>>> resource agent to instruct other agents to move...
>>
>> no, I don't think this is possible IMHO
>>
>> Regards,
>> Andreas
>>
>> -- 
>> Need help with Pacemaker?
>> http://www.hastexo.com/now
>>
>>
>>>
>>> Thanks,
>>> Dmitry
>>>
>>>
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>>
>>
>>
> 
> 
> 
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>> Bugs: http://developerbugs.linux-foundation.org/enter_bug.cgi?product=Pacemaker
> 
> 
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> 
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> Getting started: http://www.clusterlabs.org/doc/Cluster_from_Scratch.pdf
> Bugs: http://developerbugs.linux-foundation.org/enter_bug.cgi?product=Pacemaker

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