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Hi Alan,
So, can I include the cinder-netapp-storage.yaml file in the central site
and then use the new backend to add storage to edge VM's?
I believe it is not possible right?? as the cinder volume in the edge won't
have the config for the netapp.

With regards,
Swogat Pradhan

On Thu, May 25, 2023 at 2:17 AM Alan Bishop <abishop at redhat.com> wrote:

>
>
> On Wed, May 24, 2023 at 3:15 AM Swogat Pradhan <swogatpradhan22 at gmail.com>
> wrote:
>
>> Hi,
>> I have a DCN setup and there is a requirement to use a netapp storage
>> device in one of the edge sites.
>> Can someone please confirm if it is possible?
>>
>
> I see from prior email to this list that you're using tripleo, so I'll
> respond with that in mind.
>
> There are many factors that come into play, but I suspect the short answer
> to your question is no.
>
> Tripleo's DCN architecture requires the cinder-volume service running at
> edge sites to run in active-active
> mode, where there are separate instances running on three nodes in to for
> the service to be highly
> available (HA).The problem is that only a small number of cinder drivers
> support running A/A, and NetApp's
> drivers do not support A/A.
>
> It's conceivable you could create a custom tripleo role that deploys just
> a single node running cinder-volume
> with a NetApp backend, but it wouldn't be HA.
>
> It's also conceivable you could locate the NetApp system in the central
> site's controlplane, but there are
> extremely difficult constraints you'd need to overcome:
> - Network latency between the central and edge sites would mean the disk
> performance would be bad.
> - You'd be limited to using iSCSI (FC wouldn't work)
> - Tripleo disables cross-AZ attachments, so the only way for an edge site
> to access a NetApp volume
> would be to configure the cinder-volume service running in the
> controlplane with a backend availability
> zone set to the edge site's AZ. You mentioned the NetApp is needed "in one
> of the edge sites," but in
> reality the NetApp would be available in one, AND ONLY ONE edge site, and
> it would also not be available
> to any instances running in the central site.
>
> Alan
>
>
>> And if so then should i add the parameters in the edge deployment script
>> or the central deployment script.
>> Any suggestions?
>>
>> With regards,
>> Swogat Pradhan
>>
>
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