[ovirt-users] Re: Ovirt/ RHV Disaster Recovery Designing

[Maor Lipchuk]

Thanks Greg for the quick respond and cc'ing me.

Hi Tanzeeb, great to talk with you.
Please allow me to comment inline and I hope it will clear things out for
you.
Basically the solution we are discussing about is the site-so-site solution
for oVirt-DR
The official documentation for it is at
[1]
https://access.redhat.com/documentation/en-us/red_hat_virtualization/4.2/pdf/disaster_recovery_guide/Red_Hat_Virtualization-4.2-Disaster_Recovery_Guide-en-US.pdf

I recomment that you take a look into that documentation since it might
answer many of your questions.

Please feel free to contact me on anything that is still unclear

Regards,
Maor

On Sat, Jul 7, 2018 at 12:38 AM, Greg Sheremeta  wrote:

> Hi Tanzeeb,
>
> Unfortunately googling for 'ovirt disaster recovery' doesn't achieve a
> great result. Search for things developed primarily by Maor [cc'd] recently.
>
> On Fri, Jul 6, 2018 at 12:59 PM  wrote:
>
>> Hi
>> I've looking for some ideas about designing disaster recovery planning
>> with ovirt 4.2. Since 4.2 we have options to have intergration with
>> disaster recovery site also. I went through some videos at internet and
>> want to share if those are correct or not. Thus you can help me regarding
>> what other things I should be having ideas during planning and designing
>> more about this.
>>
>> 1. We've to keep both sites on and already created datacenter, cluster
>> and one site with storage domain attached and other site with no storage
>> domain.
>
>
That is correct


> 2. We've to keep latency of 10ms at maximum between both sites.
>
>
That depends on your replication configuration process, sounds good to me.


> 3. Have to configure virtual machines with affinity group.
>>
>
You don't have to do that to support the DR site-to-site


> 4. The VM's which are configured as high-available vm, will be migrated
>> first.
>>
>
Not exactly, all the VMs will be migrated, regardless whether those are HA
or not, the HA VMs will run first (if those were running before on the
primary setup)


> 5. There's an Ansible script while have to run to fail over and fail back.
>>
>
Indeed, and also a python script that make it more user friendly.


>
>> Now, please could you help me out regarding this.
>> 1. Where can I find this ansible script? Is this
>> https://github.com/oVirt/ovirt-ansible-disaster-recovery.git?
>>
>
> yes. Note the youtube links on that.
>
> @Maor for the rest of your questions.
>
>
>> 2. Can this script run at rhv also ? or just for ovirt? Or what other
>> changes I have to make for rhv to have this functionalities?
>>
>
Theoratically, the script should also run on RHV as well, but I would not
recommend to mix between the two in one setup.


> 3. How ovirt/rhv works with the OVN compared to NSX? Is there's any
>> challenges ?
>>
>
I don't think that is related to the oVirt DR solution.
@Dan perhaps you can shed more light on that subject.


> 4. Can you share me some high and low level diagram related to rhv
>> disaster planning?
>>
>
Sure, I suggest that you look into the following documentation (see [1]) at
Figure 3.1. Active-Passive Configuration and Figuire 3.2:

I think that what is more important for you are the steps to prepare your
setup to support DR, this should also be in the documentation mentioned
above.

5. How the storage migrates on backend ? During the script ?
>>
>

The storage is not migrated, it should be replicated on the secondary
site's storage server and the secondary site should import those storage
domains.
The storage replication is managed by the admin.


> 6. Where do I run this script? During fail over at primary site and during
>> fail back at secondary site?
>>
>
The script can run on any host, while that host has python-oVirt SDK
installed (see
https://www.ovirt.org/develop/release-management/features/infra/python-sdk/
).
You can also run this script on the primary site or the secondary site.
My suggestion is that you will have a seperate machine/VM/container which
will be the the one which will run it.


> 7. Basically since only the storage migrates and all other components are
>> on already so basically backend it's only dealing with storage migration
>> according to defined policies ?
>>
>
The storage domains does not get migrated, they are being replicated.
It is a DR solution based on the storage servers, since those contain the
OVF_STORE disk which should help to recover the VMs/Templates in the setup.



>
>> Please could you help me out with some designing and ideas what're the
>> best architecture during planning on disaster recovery at RHV.
>>
>
I suggest that you take a look at [1].
There should be an explanation of the steps and also several usecases how
to test it (see APPENDIX B. TESTING THE ACTIVE-PASSIVE CONFIGURATION)


>
> If you are a Red Hat customer, a Red Hat Consulting engagement could also
> help.
>
>
>> Thank you.
>>
>> ___
>> Users mailing list -- users@ovirt.org
>> To unsubscribe send an 

[ovirt-users] Re: Ovirt/ RHV Disaster Recovery Designing

[Greg Sheremeta]

Hi Tanzeeb,

Unfortunately googling for 'ovirt disaster recovery' doesn't achieve a
great result. Search for things developed primarily by Maor [cc'd] recently.

On Fri, Jul 6, 2018 at 12:59 PM  wrote:

> Hi
> I've looking for some ideas about designing disaster recovery planning
> with ovirt 4.2. Since 4.2 we have options to have intergration with
> disaster recovery site also. I went through some videos at internet and
> want to share if those are correct or not. Thus you can help me regarding
> what other things I should be having ideas during planning and designing
> more about this.
>
> 1. We've to keep both sites on and already created datacenter, cluster and
> one site with storage domain attached and other site with no storage domain.
> 2. We've to keep latency of 10ms at maximum between both sites.
> 3. Have to configure virtual machines with affinity group.
> 4. The VM's which are configured as high-available vm, will be migrated
> first.
> 5. There's an Ansible script while have to run to fail over and fail back.
>
> Now, please could you help me out regarding this.
> 1. Where can I find this ansible script? Is this
> https://github.com/oVirt/ovirt-ansible-disaster-recovery.git?
>

yes. Note the youtube links on that.

@Maor for the rest of your questions.


> 2. Can this script run at rhv also ? or just for ovirt? Or what other
> changes I have to make for rhv to have this functionalities?
> 3. How ovirt/rhv works with the OVN compared to NSX? Is there's any
> challenges ?
> 4. Can you share me some high and low level diagram related to rhv
> disaster planning?
> 5. How the storage migrates on backend ? During the script ?
> 6. Where do I run this script? During fail over at primary site and during
> fail back at secondary site?
> 7. Basically since only the storage migrates and all other components are
> on already so basically backend it's only dealing with storage migration
> according to defined policies ?
>
> Please could you help me out with some designing and ideas what're the
> best architecture during planning on disaster recovery at RHV.
>

If you are a Red Hat customer, a Red Hat Consulting engagement could also
help.


> Thank you.
>
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-- 

GREG SHEREMETA

SENIOR SOFTWARE ENGINEER - TEAM LEAD - RHV UX

Red Hat NA



gsher...@redhat.comIRC: gshereme

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