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 <[email protected]> 
> 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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