It's solved! the ceph reef documentation was ahead of its capability. -- BR Max

On 5. Dec 2025, at 12:37, Maximilian Kaya via ceph-users <ceph-users@ceph.io> wrote:

Hi, due to ceph reef documentation I need to run only this command but I am unable to run this to exit the stretched cluster: ceph mon disable_stretch_mode distributed_cluster_rule --yes-i-really-mean-it ... no valid command found; 10 closest matches: ... Error EINVAL: invalid command …

what do I am missing ? I have ceph 18.2.7 with 5 mons and I would like to extend datacenter by adding dc3 with same number of racks,hosts and osds to get back to repsize 3 using crush rule distributed_cluster_rule:

rule distributed_cluster_rule { id 3 type replicated step take default step choose firstn 0 type datacenter step chooseleaf firstn 1 type rack step emit } .. #ceph mon dump epoch 87 fsid 583647c2-4603-11ef-9941-b360866a782f min_mon_release 18 (reef) election_strategy: 1 stretch_mode_enabled 1 tiebreaker_mon mon3 disallowed_leaders mon3 0: [v2:172.16.1.1:3300/0,v1:172.16.1.1:6789/0] mon.mon1; crush_location {datacenter=dc1} 1: [v2:172.16.1.2:3300/0,v1:172.16.1.2:6789/0] mon.mon2; crush_location {datacenter=dc2} 2: [v2:172.16.1.3:3300/0,v1:172.16.1.3:6789/0] mon.mon3; crush_location {datacenter=quorum_room} 3: [v2:172.16.1.4:3300/0,v1:172.16.1.4:6789/0] mon.mon4; crush_location {datacenter=dc2} 4: [v2:172.16.1.5:3300/0,v1:172.16.1.5:6789/0] mon.mon5; crush_location {datacenter=dc1}

is there any other way to exit stretched cluster? any help would be appreciated.

BR Max

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