The default replication of ceph is 2. Nodes are assigned to each group automatically and cannot be manually changed. if you want replication 3, you need you set that before installing storage nodes.
From: von Hoesslin, Volker [Volker.Hoesslin@swsn.de]
Sent: Monday, October 29, 2018 5:43 PM
To: 'starlingx-discuss@lists.starlingx.io'
Subject: [Starlingx-discuss] move storage node in replication group
hello,
i have 3 storage nodes and after provisioning nodes 1+2 are in replication group 0 and node 3 are in replication group 1?!
how can i move node 3 to group 0?
greetings, volker