Hi Michael, Unfortunately downgrade is not supported between two Ceph major releases. You will need to re-install the old release. Best, Redouane. On Tue, Jan 13, 2026 at 3:48 PM Michael Worsham via ceph-users < ceph-users@ceph.io> wrote:

Currently in a test-lab / sandbox environment, I am running the latest version of Ceph Tentacle release (v20.2.0) in a virtualized environment. If I wanted to downgrade back to Squid (v19.2.3), what steps would I go about doing that? I am not worried about any of the data in the environment as its strictly for testing purposes, patch assessment for OS and Ceph, etc.

ubuntu@ceph-mon1:~$ sudo ceph versions { "mon": { "ceph version 20.2.0 (69f84cc2651aa259a15bc192ddaabd3baba07489) tentacle (stable - RelWithDebInfo)": 2 }, "mgr": { "ceph version 20.2.0 (69f84cc2651aa259a15bc192ddaabd3baba07489) tentacle (stable - RelWithDebInfo)": 2 }, "osd": { "ceph version 20.2.0 (69f84cc2651aa259a15bc192ddaabd3baba07489) tentacle (stable - RelWithDebInfo)": 3 }, "mds": { "ceph version 20.2.0 (69f84cc2651aa259a15bc192ddaabd3baba07489) tentacle (stable - RelWithDebInfo)": 1 }, "rgw": { "ceph version 20.2.0 (69f84cc2651aa259a15bc192ddaabd3baba07489) tentacle (stable - RelWithDebInfo)": 2 }, "overall": { "ceph version 20.2.0 (69f84cc2651aa259a15bc192ddaabd3baba07489) tentacle (stable - RelWithDebInfo)": 10 } }

Environment is running Ubuntu v22.04 and Ceph was deployed via cephadm.

-- Michael

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