Re: [ovirt-users] Live migration without Shared Storage

[Michal Skrivanek]

> On 28 Dec 2017, at 20:37, FERNANDO FREDIANI  wrote:
> 
> Are you talking about all kinds of Storage (iSCSI, FC, NFS and 
> Localstorage/POSIX) ?
> 
yes

> Because I believe you may be able to specify the destination path on the 
> destination Host and when working with Localstorage/POSIX that may be simpler.
> 
yes, it is indeed more simple, but still it’s not going to work out of the box 
right now. It’s a non-trivial feature to do that properly
> Fernando
> 
> On 28/12/2017 17:32, Michal Skrivanek wrote:
>> 
>> 
>>> On 28 Dec 2017, at 19:56, FERNANDO FREDIANI >> > wrote:
>>> 
>>> Has anyone tried the command below under the hood between two oVirt Node 
>>> (in the same Datacenter or between two different (local) ones) ? Does it 
>>> work ?
>> 
>> no, it does not with ovirt. ovirt manages storage differently than plain 
>> libvirt
>> 
>>> virsh migrate --live --persistent --undefinesource --copy-storage-all \
>>> --verbose --desturi  
>>> This is such a fantastic features for certain scenarios that may help a lot 
>>> maintenance or even migration between hosts with Local Storage to minimize 
>>> Downtime and mainly all the hassle of having to Poweroff a VM, Export to an 
>>> Export Datastore, umount it, mount on the other 
>>> Host/Datacenter, Import and Power On.
>>> 
>>> Thanks
>>> Regards
>>> 
>>> Fernando
>>> 
>>> [1] Ref: 
>>> https://hgj.hu/live-migrating-a-virtual-machine-with-libvirt-without-a-shared-storage/
>>>  
>>> 
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>>> http://lists.ovirt.org/mailman/listinfo/users 
>>> 
>> 
> 

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Re: [ovirt-users] Live migration without Shared Storage

[FERNANDO FREDIANI]

Are you talking about all kinds of Storage (iSCSI, FC, NFS and 
Localstorage/POSIX) ?


Because I believe you may be able to specify the destination path on the 
destination Host and when working with Localstorage/POSIX that may be 
simpler.


Fernando


On 28/12/2017 17:32, Michal Skrivanek wrote:



On 28 Dec 2017, at 19:56, FERNANDO FREDIANI 
> wrote:


Has anyone tried the command below under the hood between two oVirt 
Node (in the same Datacenter or between two different (local) ones) ? 
Does it work ?


no, it does not with ovirt. ovirt manages storage differently than 
plain libvirt



virsh migrate --live --persistent --undefinesource --copy-storage-all \
     --verbose --desturi  
This is such a fantastic features for certain scenarios that may help 
a lot maintenance or even migration between hosts with Local Storage 
to minimize Downtime and mainly all the hassle of having to Poweroff 
a VM, Export to an Export Datastore, umount it, mount on the other 
Host/Datacenter, Import and Power On.


Thanks
Regards

Fernando

[1] Ref: 
https://hgj.hu/live-migrating-a-virtual-machine-with-libvirt-without-a-shared-storage/

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Re: [ovirt-users] Live migration without Shared Storage

[Michal Skrivanek]

> On 28 Dec 2017, at 19:56, FERNANDO FREDIANI  wrote:
> 
> Has anyone tried the command below under the hood between two oVirt Node (in 
> the same Datacenter or between two different (local) ones) ? Does it work ?

no, it does not with ovirt. ovirt manages storage differently than plain libvirt

> virsh migrate --live --persistent --undefinesource --copy-storage-all \
> --verbose --desturi  
> This is such a fantastic features for certain scenarios that may help a lot 
> maintenance or even migration between hosts with Local Storage to minimize 
> Downtime and mainly all the hassle of having to Poweroff a VM, Export to an 
> Export Datastore, umount it, mount on the other Host/Datacenter, Import and 
> Power On.
> 
> Thanks
> Regards
> 
> Fernando
> 
> [1] Ref: 
> https://hgj.hu/live-migrating-a-virtual-machine-with-libvirt-without-a-shared-storage/
>  
> 
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[ovirt-users] Live migration without Shared Storage

[FERNANDO FREDIANI]

Has anyone tried the command below under the hood between two oVirt Node 
(in the same Datacenter or between two different (local) ones) ? Does it 
work ?


virsh migrate --live --persistent --undefinesource --copy-storage-all \
    --verbose --desturi  

This is such a fantastic features for certain scenarios that may help a 
lot maintenance or even migration between hosts with Local Storage to 
minimize Downtime and mainly all the hassle of having to Poweroff a VM, 
Export to an Export Datastore, umount it, mount on the other 
Host/Datacenter, Import and Power On.


Thanks
Regards

Fernando

[1] Ref: 
https://hgj.hu/live-migrating-a-virtual-machine-with-libvirt-without-a-shared-storage/
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Re: [ovirt-users] Live migration without shared storage

[Michal Skrivanek]

> On 21 Dec 2017, at 17:14, FERNANDO FREDIANI  wrote:
> 
> That is going certainly to be a very welcome feature and if not yet should be 
> on the top of th roadmap. For planned maintenances it solves mostly all 
> downtime problems.
> 
> 

It is in the roadmap[1] but there’s no active work on it yet, oVirt is 
primarily built around shared storage

Thanks,
michal

[1] https://bugzilla.redhat.com/show_bug.cgi?id=1326857
> Fernando
> 
> On 21/12/2017 12:19, Pujan Shah wrote:
>> We have a bit odd setup where some of our clients have dedicated hosts and 
>> we also have some shared hosts. We can migrate client VMs from their 
>> dedicated host to shared host if we need ot do some maintenance. We don't 
>> have shared storage and currently we are using XenServer which supports live 
>> migration without shared storage. We recently started looking into KVM as an 
>> alternative and decided to try ovirt. To our surprise KVM supports live 
>> migration without shared storage but ovirt does not. 
>> (https://hgj.hu/live-migrating-a-virtual-machine-with-libvirt-without-a-shared-storage/
>>  
>> )
>>   
>> 
>> ​I wanted to know if anyone has dealt with such situation and is this 
>> something others are also looking for?​
>> 
>> 
>> ​Regards,
>> Pujan Shah
>> Systemadministration
>> 
>> --
>> tel.: +49 (0) 221 / 95 168 - 74
>> mail: ​ ​ p...@dom.de 
>> DOM Digital Online Media GmbH,
>> Bismarck Str. 60
>> 50672 Köln
>> 
>> http://www.dom.de/ 
>> 
>> Geschäftsführer: Markus Schulte
>> Handelsregister-Nr.: Amtsgericht Köln HRB 55347
>> UST.-Ident.Nr. DE 814 416 951
>> 
>> 
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> 
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Re: [ovirt-users] Live migration without shared storage

[FERNANDO FREDIANI]

That is going certainly to be a very welcome feature and if not yet 
should be on the top of th roadmap. For planned maintenances it solves 
mostly all downtime problems.


Fernando


On 21/12/2017 12:19, Pujan Shah wrote:
We have a bit odd setup where some of our clients have dedicated hosts 
and we also have some shared hosts. We can migrate client VMs from 
their dedicated host to shared host if we need ot do some maintenance. 
We don't have shared storage and currently we are using XenServer 
which supports live migration without shared storage. We recently 
started looking into KVM as an alternative and decided to try ovirt. 
To our surprise KVM supports live migration without shared storage but 
ovirt does not. 
(https://hgj.hu/live-migrating-a-virtual-machine-with-libvirt-without-a-shared-storage/) 



​I wanted to know if anyone has dealt with such situation and is this 
something others are also looking for?​



​Regards,
Pujan Shah
Systemadministration

--
tel.: +49 (0) 221 / 95 168 - 74
mail:
​ ​
p...@dom.de 
DOM Digital Online Media GmbH,
Bismarck Str. 60
50672 Köln

http://www.dom.de/

Geschäftsführer: Markus Schulte
Handelsregister-Nr.: Amtsgericht Köln HRB 55347
UST.-Ident.Nr. DE 814 416 951


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[ovirt-users] Live migration without shared storage

[Pujan Shah]

We have a bit odd setup where some of our clients have dedicated hosts and
we also have some shared hosts. We can migrate client VMs from their
dedicated host to shared host if we need ot do some maintenance. We don't
have shared storage and currently we are using XenServer which supports
live migration without shared storage. We recently started looking into KVM
as an alternative and decided to try ovirt. To our surprise KVM supports
live migration without shared storage but ovirt does not. (
https://hgj.hu/live-migrating-a-virtual-machine-with-libvirt-without-a-shared-storage/)


​I wanted to know if anyone has dealt with such situation and is this
something others are also looking for?​


​Regards,
Pujan Shah
Systemadministration

--
tel.: +49 (0) 221 / 95 168 - 74
mail:
​ ​
p...@dom.de
DOM Digital Online Media GmbH,
Bismarck Str. 60
50672 Köln

http://www.dom.de/

Geschäftsführer: Markus Schulte
Handelsregister-Nr.: Amtsgericht Köln HRB 55347
UST.-Ident.Nr. DE 814 416 951
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