Creating ceph pool

[raydel92]

Hello,

I have Proxmox in a two nodes configuration whit 2 HDD each for deploying Ceph. When I create the Pool I got this warning:

active+undersized+degraded: 128

the Size/Min of the pool is 3/2 with 128 PGs

Any explanation why I get this warning?

Thanks

 

[Stoiko Ivanov]

Put shortly - ceph will only work in a sensible manner with minimum 3 nodes
see the reference documentation: https://docs.ceph.com/docs/master/start/intro/

Else the default crush-map has a failure domain of host thus each pg needs to replicated to 3 hosts - since you have only 2 hosts the pg's are all undersized.

I hope this helps!