Ceph support is available via Managed Block Storage (tech preview), it
cannot be used instead of gluster for hyperconverged setups.

Moreover, it is not possible to use a pure Managed Block Storage setup
at all, there has to be at least one regular storage domain in a
datacenter

On Mon, Jan 18, 2021 at 11:58 AM Shantur Rathore <rathor...@gmail.com> wrote:
>
> Thanks Strahil for your reply.
>
> Sorry just to confirm,
>
> 1. Are you saying Ceph on oVirt Node NG isn't possible?
> 2. Would you know which devs would be best to ask about the recent Ceph 
> changes?
>
> Thanks,
> Shantur
>
> On Sun, Jan 17, 2021 at 4:46 PM Strahil Nikolov via Users <users@ovirt.org> 
> wrote:
>>
>> В 15:51 +0000 на 17.01.2021 (нд), Shantur Rathore написа:
>>
>> Hi Strahil,
>>
>> Thanks for your reply, I have 16 nodes for now but more on the way.
>>
>> The reason why Ceph appeals me over Gluster because of the following reasons.
>>
>> 1. I have more experience with Ceph than Gluster.
>>
>> That is a good reason to pick CEPH.
>>
>> 2. I heard in Managed Block Storage presentation that it leverages storage 
>> software to offload storage related tasks.
>> 3. Adding Gluster storage limits to 3 hosts at a time.
>>
>> Only if you wish the nodes to be both Storage and Compute. Yet, you can add 
>> as many as you wish as a compute node (won't be part of Gluster) and later 
>> you can add them to the Gluster TSP (this requires 3 nodes at a time).
>>
>> 4. I read that there is a limit of maximum 12 hosts in Gluster setup. No 
>> such limitation if I go via Ceph.
>>
>> Actually , it's about Red Hat support for RHHI and not for Gluster + oVirt. 
>> As both oVirt and Gluster ,that are used, are upstream projects, support is 
>> on best effort from the community.
>>
>> In my initial testing I was able to enable Centos repositories in Node Ng 
>> but if I remember correctly, there were some librbd versions present in Node 
>> Ng which clashed with the version I was trying to install.
>> Does Ceph hyperconverge still make sense?
>>
>> Yes it is. You got the knowledge to run the CEPH part, yet consider talking 
>> with some of the devs on the list - as there were some changes recently in 
>> oVirt's support for CEPH.
>>
>> Regards
>> Shantur
>>
>> On Sun, Jan 17, 2021, 9:58 AM Strahil Nikolov via Users <users@ovirt.org> 
>> wrote:
>>
>> Hi Shantur,
>>
>> the main question is how many nodes you have.
>> Ceph integration is still in development/experimental and it should be wise 
>> to consider Gluster also. It has a great integration and it's quite easy to 
>> work with).
>>
>>
>> There are users reporting using CEPH with their oVirt , but I can't tell how 
>> good it is.
>> I doubt that oVirt nodes come with CEPH components , so you most probably 
>> will need to use a full-blown distro. In general, using extra software on 
>> oVirt nodes is quite hard .
>>
>> With such setup, you will need much more nodes than a Gluster setup due to 
>> CEPH's requirements.
>>
>> Best Regards,
>> Strahil Nikolov
>>
>>
>>
>>
>>
>>
>> В неделя, 17 януари 2021 г., 10:37:57 Гринуич+2, Shantur Rathore 
>> <shantur.rath...@gmail.com> написа:
>>
>>
>>
>>
>>
>> Hi all,
>>
>> I am planning my new oVirt cluster on Apple hosts. These hosts can only have 
>> one disk which I plan to partition and use for hyper converged setup. As 
>> this is my first oVirt cluster I need help in understanding few bits.
>>
>> 1. Is Hyper converged setup possible with Ceph using cinderlib?
>> 2. Can this hyper converged setup be on oVirt Node Next hosts or only Centos?
>> 3. Can I install cinderlib on oVirt Node Next hosts?
>> 4. Are there any pit falls in such a setup?
>>
>>
>> Thanks for your help
>>
>> Regards,
>> Shantur
>>
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