Re: Prediction or studies for KVM live migration.

[Andrija Panic <an...@gmail.com>]

..as I assumed - and it exports volume to Secondary Storage as the
intermediate location - all good.
So "live storage migration" doesn't work, as expected.

cheers,

On Fri, 28 May 2021 at 14:11, Kalil de Albuquerque Carvalho <
kalil.carvalho@hybriddc.com.br> wrote:

> Hello Andrija.
>
> Sorry for the mess. Instance migration, just about VM's, memory, vCPU
> works fine, on the fly. But if is needed to migrate a volume from one
> primary storage to other is needed the VM must be halted.
>
> I had tested of migration from a Gluster primary Storage to a NFS primary
> storage, and contrariwise, and worked well but just with powerd off VM's.
>
> Best regars.
> Em 27/05/2021 20:18, Andrija Panic escreveu:
>
> I understood you said that LIVE storage migration (migrate VM's volumes
> (with the VM)) works while VM is RUNNING.
>
> Are you now saying this is NOT working (which is what I would expect), and
> that only stopped VM migration is possible from GLuster to NFS?
>
> best,
>
> On Wed, 26 May 2021 at 22:04, Kalil de Albuquerque Carvalho <
> kalil.carvalho@hybriddc.com.br> wrote:
>
>> Hello Andrija.
>>
>> Gluster as primary storage works fine. Storage migration, with powered
>> off VM's, it's working  too. My problem is just doing this with VM's
>> running.
>>
>> I'm using Ubuntu 20.02, CentOS 7 and Windows 10 and 2016 for testing and
>> not working.
>>
>> But it is the life, thaks all
>>
>> Best regards,
>>
>>
>> Em 26/05/2021 16:41, Andrija Panic escreveu:
>>
>> I thought I replied to this one, but I dont' see my email...
>>
>> So, from CEPH/NFS to SolidFire should work (in this direction only)  - or
>> let me say "used to work" (haven't tested it recently) - this was developed
>> for my ex-company where I use to work, by Mike Tutkowski from NetApp)
>> Also, my understanding is that it's also possible to migrate VMs using
>> local storage from host to host (whole VM with its disks) - @Gabriel
>> Beims Bräscher <ga...@gmail.com> can confirm this, afaik?
>>
>> If you are using Ubuntu - all fine - qemu-kvm supports live storage
>> migrations from Ubuntu 14.04 at least, an onwards.
>> If you are using CentOS 7, you have to use qemu-kvm-ev from the oVirt
>> repo ONLY - all other versions of qemu-kvm do NOT support storage live
>> migration (Redhat revoked it for $$$ reasons, while it was working fine in
>> CentOS6)
>>
>> If your tested it and it worked from Gluster to NFS - that's (great) news
>> (for me).
>>
>> Hope that helps,
>>
>> Cheers,
>>
>> On Wed, 26 May 2021 at 20:06, Wido den Hollander <wi...@widodh.nl> wrote:
>>
>>>
>>>
>>> On 26/05/2021 13:55, Kalil de Albuquerque Carvalho wrote:
>>> > Hello Wido.
>>> >
>>> > Sorry about that. I was not so clear, or made some misunderstanding.
>>> >
>>> > Doing some corrections, I've tested migration from Gluster to NFS, and
>>> > the reverse, and every think worked well. So, please, disregard this
>>> > part of my question. I should would did this test before made the
>>> question.
>>> >
>>> > My question, now, is when will be support, if will be, with the
>>> running
>>> > VM's. Today, I'm testing the version 4.15, just working with power off
>>> > VM's.
>>> >
>>> Aha, you mean live storage migration between different types of primary
>>> storage.
>>>
>>> That is indeed not supported with KVM and also not on the roadmap at the
>>> moment.
>>>
>>> Wido
>>>
>>> > Best regards.
>>> >
>>> > Em 26/05/2021 04:08, Wido den Hollander escreveu:
>>> >>
>>> >>
>>> >> On 25/05/2021 13:32, Kalil de Albuquerque Carvalho wrote:
>>> >>> Hello all.
>>> >>>
>>> >>> Reading the manual I discovery that live migration is not support
>>> for
>>> >>> KVM hypervisor. I was wander if there are studies or predictions for
>>> >>> this features on KVM hosts.
>>> >>>
>>> >>
>>> >> Where did you read this? Live Migration with the KVM hypervisor works
>>> >> just fine.
>>> >>
>>> >> Wido
>>> >>
>>> >>> Yet on the manual citation, it said that migration just can occur
>>> >>> from CEPH/NFS to "SolidFire Managed Storage". On my tests we are
>>> >>> using Gluster as Primary Storage and not appear any storage to
>>> >>> migrate to. We created tow differents Primary Storages for this kind
>>> >>> of tests. Is that correct, migration in this case just will occur
>>> >>> from/to CEPH/NFS? If yes, will be same future release that will be
>>> >>> possible migration between Guster storages?
>>> >>>
>>> >>> Best regars.
>>> >>>
>>> >>
>>>
>>
>>
>> --
>>
>> Andrija Panić
>>
>>
>
> --
>
> Andrija Panić
>
>

-- 

Andrija Panić