Re: Best practice for expanding Ceph cluster

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Hey,

A question slightly related to this:

> I would suggest that you add all new hosts and make the OSDs start
> > with a super-low initial weight (0.0001 or so), which means they will
> > be in and up, but not receive any PGs.


Is it possible to have the correct weight set and use ceph osd set noin .

I'll probably test this at some point, but would this maybe have the same
end result without needing to reweight the OSDs?

>From the ceph docs
<https://docs.ceph.com/en/quincy/rados/troubleshooting/troubleshooting-osd/#flapping-osds>
:

Two other flags are supported, noin and noout, which prevent booting OSDs
from being marked in (allocated data) or protect OSDs from eventually being
marked out (regardless of what the current value for mon osd down out
interval is).
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