Hi, I ended up with having whole set of osds to get back original ceph cluster. I figured out to make the cluster running. However, it's status is something as below: bash-4.4$ ceph -s cluster: id: 3f271841-6188-47c1-b3fd-90fd4f978c76 health: HEALTH_WARN 7 daemons have recently crashed 4 slow ops, oldest one blocked for 35077 sec, daemons [mon.a,mon.b] have slow ops. services: mon: 3 daemons, quorum a,b,d (age 9h) mgr: b(active, since 14h), standbys: a osd: 4 osds: 0 up, 4 in (since 9h) data: pools: 0 pools, 0 pgs objects: 0 objects, 0 B usage: 0 B used, 0 B / 0 B avail pgs: All osds are down. I checked the osds logs and attached with this. Please help and I wonder if it's possible to get the cluster back. I have some backup for monitor's data. Till now I haven't restore that in the course. Thanks, Ben