If the ceph roadmap is getting rid of named clusters, how will multiple
clusters be supported? How (for instance) would `/var/lib/ceph/mon/{name}`
directories be resolved?
> On Mar 11, 2020, at 8:29 PM, Brian Topping <[email protected]> wrote:
>
>> On Mar 11, 2020, at 7:59 PM, Anthony D'Atri <[email protected]> wrote:
>>
>>> This is all possible with a single cluster, but this limited node also
>>> needs storage.
>>
>> Are you saying that the limited node needs to access Ceph-based storage? Is
>> this some sort of converged architecture?
>
> It is a converged architecture in that all three boxes are running
> Kubernetes. There is one k8s cluster on each side of the link, let’s call
> them “primary” and “secondary”:
> * The primary k8s cluster will only access storage from the primary Ceph
> cluster, secondary k8s only accesses storage from secondary Ceph.
> * Primary Ceph gets monitors on both sides of the link. Secondary Ceph only
> has monitors on the secondary side.
>
> In a netsplit situation, the primary Ceph will maintain quorum with both
> nodes on the primary side. The secondary Ceph cluster only exists separately
> for this netsplit situation and the secondary k8s cluster can continue
> unaffected.
>
> With this in place, the primary side can continue operating with either
> primary node downed for maintenance via a suboptimal quorum over the WAN
> link. I cannot do that today.
>
> I am sacrificing the case where there is a netsplit at the same time I am
> doing maintenance.
>
> Thanks for your input!
> Brian
>
>
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