New pool in ceph - without touching the old one

Hi,
I have a 4 node proxmox cluster with ceph.
The version is 5.3. I have 1 pool with 16 OSDs - SSD.
Now I added several nodes to the cluster and I want the new OSDs be a part of a different pool.
I understand that this can only be done via device class settings:

ceph osd crush rule create-replicated <rule-name> <root> <failure-domain> <class>
ceph osd pool set <pool-name> crush_rule <rule-name>

So I have several questions:
<class> should be ssd/hdd/etc, but both of my pools will be SSD...

Read more