At 2026-05-29 23:01:18, "Anthony D'Atri via dev" <dev@ceph.io> wrote:

I’ve struggled a bit understanding this strategy.  Help me understand please how completely disabling the filesystem / volume is more tolerable than reducing to one?

On May 29, 2026, at 4:30 AM, Dhairya Parmar via dev <dev@ceph.io> wrote:



Hi,

There is a solution for this (which works by failing the filesystem), please check the note here - https://docs.ceph.com/en/latest/cephadm/upgrade/#starting-the-upgrade

Dhairya Parmar

Software Engineer, CephFS

On Fri, May 29, 2026 at 3:17 PM 刘先生 via dev <dev@ceph.io> wrote:

hi:

Our Ceph cluster is deployed using Ceph cephadm and uses multiple MDS daemons. The documentation says that during a cephadm upgrade, the filesystem should be reduced to a single active MDS. However, this is not feasible for us(single mds have not enough mem). Is there a more elegant way to perform the upgrade?
Thank you very much.