Re: cephfs flags question

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On Thu, Dec 17, 2020 at 11:35 AM Stefan Kooman <stefan@xxxxxx> wrote:
>
> On 12/17/20 7:45 PM, Patrick Donnelly wrote:
>
> >
> > When a file system is newly created, it's assumed you want all the
> > stable features on, including multiple MDS, directory fragmentation,
> > snapshots, etc. That's what those flags are for. If you've been
> > upgrading your cluster, you need to turn those on yourself.
> OK, fair enough. So I tried adding "allow_dirfrags" which gives me:
>
> ceph fs set cephfs allow_dirfrags true
> Directory fragmentation is now permanently enabled. This command is
> DEPRECATED and will be REMOVED from future releases.
>
> And I enabled snapshot support:
>
> ceph fs set cephfs allow_new_snaps true
> enabled new snapshots
>
> However, this has not changed the "flags" of the filesystem in any way.
> So I guess there are still features not enabled that are enabled on
> newly installed clusters. Where can I find a list of features that I can
> enable?

Apologies for linking code:
https://github.com/ceph/ceph/blob/master/src/include/ceph_fs.h#L275-L285

>I have searched through documentation but I don't see anything
> related. It's also not described / suggested in the part about upgrading
> the MDS cluster (IMHO that would be a logical place) [1].

You're the first person I'm aware of asking for this. :)

-- 
Patrick Donnelly, Ph.D.
He / Him / His
Principal Software Engineer
Red Hat Sunnyvale, CA
GPG: 19F28A586F808C2402351B93C3301A3E258DD79D
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