fyi - the xattr is indeed required even if the dir is under a subvolumegroup dir
there's some management involved in the way the subvolume dir is created
On Thu, Aug 24, 2023 at 5:10 PM Eugen Block <eblock@xxxxxx> wrote:
>
> Thanks, I understand that. I was just explicitly asking for the
> conversion of an existing directory (created without subvolume) with
> xattr as mentioned in the thread [2]. Anyway, apparently it works like
> Anh Phan stated in his response, moving an existing directory to the
> subvolumegroup subdir makes it a subvolume. So there's no need for
> xattr here.
>
> Thanks,
> Eugen
>
> Zitat von Milind Changire <mchangir@xxxxxxxxxx>:
>
> > well, you should've used the ceph command to create the subvol
> > it's much simpler that way
> >
> > $ ceph fs subvolume create mycephfs subvol2
> >
> > The above command creates a new subvol (subvol2) in the default
> > subvolume group.
> > So, in your case the actual path to the subvolume would be
> >
> > /mnt/volumes/_nogroup/subvol2/<uuid>
> >
> >
> > On Tue, Aug 22, 2023 at 4:50 PM Eugen Block <eblock@xxxxxx> wrote:
> >>
> >> Hi,
> >>
> >> while writing a response to [1] I tried to convert an existing
> >> directory within a single cephfs into a subvolume. According to [2]
> >> that should be possible, I'm just wondering how to confirm that it
> >> actually worked. Because setting the xattr works fine, the directory
> >> just doesn't show up in the subvolume ls command. This is what I tried
> >> (in Reef and Pacific):
> >>
> >> # one "regular" subvolume already exists
> >> $ ceph fs subvolume ls cephfs
> >> [
> >> {
> >> "name": "subvol1"
> >> }
> >> ]
> >>
> >> # mounted / and created new subdir
> >> $ mkdir /mnt/volumes/subvol2
> >> $ setfattr -n ceph.dir.subvolume -v 1 /mnt/volumes/subvol2
> >>
> >> # still only one subvolume
> >> $ ceph fs subvolume ls cephfs
> >> [
> >> {
> >> "name": "subvol1"
> >> }
> >> ]
> >>
> >> I also tried it directly underneath /mnt:
> >>
> >> $ mkdir /mnt/subvol2
> >> $ setfattr -n ceph.dir.subvolume -v 1 /mnt/subvol2
> >>
> >> But still no subvolume2 available. What am I missing here?
> >>
> >> Thanks
> >> Eugen
> >>
> >> [1]
> >> https://lists.ceph.io/hyperkitty/list/ceph-users@xxxxxxx/thread/G4ZWGGUPPFQIOVB4SFAIK73H3NLU2WRF/
> >> [2] https://www.spinics.net/lists/ceph-users/msg72341.html
> >>
> >> _______________________________________________
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> >>
> >
> >
> > --
> > Milind
>
>
>
--
Milind
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