Den tis 10 juni 2025 kl 12:49 skrev Mahdi Noorbala <noorbala7...@gmail.com>:
> Hello everybody
> We have a ceph cluster in production. It's used for openstack as rbd image.
> Now we want to change netmask from /22 to /21.

Where? On the clients, on the cluster or the ceph.conf network configs or all?

> What do you think?
> Is there any problem in this change?
> Is there any concern about this change?

As long as all parts can reach eachother via layer-3 (ie, IP
connectivity works) then you should be able to change netmask size as
you like.
You might want to restart daemons after changing ceph.conf, to make
sure they work correctly after the change, since you would want to
notice this now when you know the reason, and not 6 months later when
you run an upgrade and can't remember what recently changed.


--
May the most significant bit of your life be positive.
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