[one-users] perform "actions" on host just before Live Migration start??

[Jaime Melis]

Good idea, could you open a feature request?

BTW, would you mind sharing the libvirt hook you wrote?

Thanks!

On Thu, May 17, 2012 at 9:02 PM, fc lists <fclists at pr-z.info> wrote:

> Brillant! ,
>
> that will perfectly work in my case.
>
> I wrote the DS and TM drivers to work out of a single Target (per project
> more or less) with multiple LUNs ... that means that i only need 1 login
> (that i actually can perform outside of ONE as well as during the LN so to
> ensure that all hosts in the cluster are logged in to the ISCSI target) and
> then i can use a simple "iscsiadm -m session -R" to pick device for VM that
> is being live migrated.
>
> The only thing that disappoint me a bit is that i will have to perform
> this configuration outside of openebula ... but i see your point about it.
> I think it might be useful to have some kind of hook related to the
> live-migration command in opennebula, even if is just called when the
> live-migrate command is called.
> This way it would be possible to access the Image variables ...especially
> Source.
>
> Thanks for pointing the link anyway, in my case will really do the trick.
>
> -FC
>
>
>
>
> On Wed, May 16, 2012 at 10:46 AM, Jaime Melis <jmelis at opennebula.org>wrote:
>
>> Hello,
>>
>> OpenNebula can't have control overt the internal live-migration process
>> of the hypervisors. The iscsi actions should be perfectly synchronized with
>> the live migration, otherwise an I/O error is likely to occur. That's the
>> reason why this isn't out of the box supported with OpenNebula.
>>
>> I believe the correct way to approach this is through hypervisor hooks:
>> http://libvirt.org/hooks.html#qemu_migration
>>
>> cheers,
>> Jaime
>>
>> On Tue, May 15, 2012 at 8:56 PM, fc lists <fclists at pr-z.info> wrote:
>>
>>> Hi,
>>>
>>> I am trying to hook up  a NexentaStor ISCSI server with opennebula 3.4.1
>>>
>>> I created a DS_MAD and TM_MAD out of the current "iscsi" ones and i got
>>> everything working fine ... other then live migration.
>>>
>>> Things goes like this:
>>>
>>> Create New Virtual Machine
>>>
>>> oneadmin ssh to HOST1
>>>  - login into ISCSI
>>>  - LN the system datastore (NFS Shared) disk to the ISCSI device
>>>
>>> live migrate from HOST1 to HOST2
>>>
>>> At this point HOST 2 has no knowledge of ISCSI device ... because the FE
>>> never performed ISCSI login on host2.
>>>
>>> "at first" i thought that the "MV" TM_MAD would be called for
>>> live-migration the same way it get executed for cold migration, but it does
>>> not seem so on my system.
>>> Cold migration works just fine because it actively login the ISCSI
>>> target in the HOST2 , with live-migration it seems like ONE does not really
>>> interact with the cluster other then performing the libvirt/kvm live
>>> migration.
>>>
>>> As a proof of concept it was enough to manually login the ISCSI target
>>> on HOST2 and live-migration worked perfectly.
>>>
>>> Is there any hook that i can use to manage this operation ? Ideally it
>>> would be enough to get the Image SOURCE available to get it to work.
>>>
>>> Thanks
>>> -FC
>>>
>>> _______________________________________________
>>> Users mailing list
>>> Users at lists.opennebula.org
>>> http://lists.opennebula.org/listinfo.cgi/users-opennebula.org
>>>
>>>
>>
>>
>> --
>> Jaime Melis
>> Project Engineer
>> OpenNebula - The Open Source Toolkit for Cloud Computing
>> www.OpenNebula.org | jmelis at opennebula.org
>>
>
>


-- 
Jaime Melis
Project Engineer
OpenNebula - The Open Source Toolkit for Cloud Computing
www.OpenNebula.org | jmelis at opennebula.org
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