Description of problem: seeing 'up+error' and 'split-brain detected' when I do 'demote' on primary and 'promote' on secondary. (initial state is up+stopped on primary and Up+ Replaying on secondary) root@ceph-rbd1-cd-cg-x49tk0-node2 ~]# rbd mirror group demote p1/ns1/g1 2025-04-03T07:59:50.180+0000 7f5791140640 -1 librbd::mirror::snapshot::GroupUnlinkPeerRequest: 0x559bac3c9ba0 handle_remove_group_snapshot: failed to remove image snapshot metadata: (30) Read-only file system Group demoted to non-primary [root@ceph-rbd2-cd-cg-x49tk0-node2 ~]# rbd mirror group promote p1/ns1/g1 Group promoted to primary [root@ceph-rbd1-cd-cg-x49tk0-node2 ~]# rbd mirror group status p1/ns1/g1 g1: global_id: 6c3e1329-ac3a-46cf-8234-27c0a854d11a state: up+error description: split-brain detected service: ceph-rbd1-cd-cg-x49tk0-node5.qphwpz on ceph-rbd1-cd-cg-x49tk0-node5 last_update: 2025-04-03 08:03:01 images: peer_sites: name: ceph-rbd2 state: up+stopped description: last_update: 2025-04-03 08:03:05 images: image: 3/49bec464-6559-49bd-a2b3-61982915cb07 state: up+stopped description: local image is primary image: 3/5904fee2-e6da-4e2f-ba1a-a80f9dfb2f9c state: up+stopped description: local image is primary This is happening only with the groups on namespaces. As per dev, this is already WIP and is available in the next build. Raising this BZ for tracking/reference purpose. Version-Release number of selected component (if applicable): ceph version 19.2.1-57.el9cp How reproducible: Always Steps to Reproduce: 1. 2. 3. Actual results: split brain seen Expected results: No split brain should be seen Additional info:
Since the problem described in this bug report should be resolved in a recent advisory, it has been closed with a resolution of ERRATA. For information on the advisory (Important: Red Hat Ceph Storage 8.1 security, bug fix, and enhancement updates), and where to find the updated files, follow the link below. If the solution does not work for you, open a new bug report. https://access.redhat.com/errata/RHSA-2025:9775