[SOLVED] Question regarding Ceph

[ca_maer]

I've started reading about ceph and have a question. We have a 6 nodes cluster with 2 servers with the same specs like so:

A-A
B-B
C-C

I understand that ceph need 3 nodes but would it be possible to use it in our setup so that A-A , for example are replicated together ? That would look like this (all nodes in the same cluster):

Cluster-prod
A-A (Replicated together)
B-B (Replicated together)
C-C (Replicated together)

Hope that make sense.

Thanks

 

[Alwin]

No, this is not what ceph is designed for. I guess, you are looking more for the storage replication (using zfs), to have the data on the other node, when the first fails.
https://pve.proxmox.com/pve-docs/chapter-pvesr.html

Ceph needs at least three servers for MON (monitors) to have quorum and then multiple (starting with 3) hosts to distribute the data according to its failure domain (default host). So it would make more sense to use one cluster of all hosts in a hyper-converged fashion.
https://pve.proxmox.com/pve-docs/chapter-pveceph.html

 

[ca_maer]

No, this is not what ceph is designed for. I guess, you are looking more for the storage replication (using zfs), to have the data on the other node, when the first fails.

Yeah that's what I thought. We are currently using ZFS with pvesr but was wondering if ceph was a better option for HA in our scenario. That answer my question. Thanks Alwin.