Proxmox 3 node cluster, 2 with nvme 1 with sata ssd

[dsh]

I have older server with sata ssd(intel s3510) and Epyc 3rd gen server with intel p4510. I have a budget for another server(4th gen epyc with nvme ssd).

I'm planning to build 3 node with ceph. If I mix those 3, would they bottle-necked by sata ssd server?

I will run database intensive containers of two Epyc servers and sata server will be mostly idling(running low weight containers) and just be a part of quorum.

Is it good idea, or should I get another server with nvme ssds only? Thanks in advance.

 

[gurubert]

Yes, the slowest node will be the bottleneck, especially in such a small three node cluster with Ceph.
Ceph will store one copy of each object on each node (pool size=3) so every write goes to all nodes.