Proxmox 7 nodes cluster + dedicated Ceph storage node

[onixid]

Hi, I have 3 PowerEdge R730 XL, 4 PowerEdge R740 XL and a PowerEdge R740XD (block storage) that I would like to use to setup a Proxmox cluster.
I am investigating the possibility of setting up the 7 server within the same cluster (even though the hardware specs differ between models) and use the storage node as single Ceph storage node.
I know that having one single storage node is not ideal, but this is not really meant for a mission critical environment, so having redundancy between OSDs with the same storage node should be sufficient.
Fact is that I can't find any reference to this kind of setup, all I find is Proxmox + Ceph integrations within the same hardware nodes and not towards an external Ceph node.
I would assume it is feasible, but I would appreciate a lot some guidance on how to achieve this from someone that has more hands-on experience on this kind of architecture.
Thank you very much!

 

[VictorSTS]

Why would you like to do that?

That's in no way supported, as Ceph is designed to be distributed among at least 3 hosts. If you want to use just one host for storage, use it as NFS/Samba server or maybe even iSCSI.

 

[UdoB]

and use the storage node as single Ceph storage node.

As already said: this does not make sense.

If you really want to use that single server (what about redundancy?) as storage for the whole cluster then look at "ZFS over ISCSI" - https://pve.proxmox.com/pve-docs/chapter-pvesm.html#storage_zfs

This way you get cluster-wide shared(!) Storage with all the ZFS-Goodies - as far as I can see.

Good luck