Hi,
In reply to your question for this UUID thing, we do need it for CLONING
subvolume and yes, it is a requirement.
And the subvolume mount path is the entire directory path.
On Thu, Feb 1, 2024 at 4:51 AM Matthew Melendy <mmelendy@xxxxxxxxxx> wrote:
> In our department we're getting starting with Ceph 'reef', using Ceph FUSE
> client for our Ubuntu workstations.
>
> So far so good, except I can't quite figure out one aspect of subvolumes.
>
> When I do the commands:
>
> [root@ceph1 ~]# ceph fs subvolumegroup create cephfs csvg
> [root@ceph1 ~]# ceph fs subvolume create cephfs staff csvg --size
> 2000000000000
>
> I get these results:
>
> - A subvolume group csvg is created on volume cephfs
> - A subvolume called staff is created in csvg subvolume (like
> /volumes/csvg/staff ) however there is no size limit set at this folder in
> the Ceph dashboard view
> - A folder with an random UUID name is created inside the subvolume staff
> ( like /volumes/csvg/staff/6a1b3de5-f6ab-4878-aea3-3c3c6f96ffcf ); this
> folder does have a size set on it of 2TB
>
> My questions are:
> - what's the purpose of this UUID, and is it a requirement?
> - which directory should be mounted for my clients, staff/ or
> staff/{UUID}, for the size limit to take effect?
> - is there any way to hide or disable this UUID for client mounts? (eg in
> /etc/fstab)
>
> [root@ceph1 ~]# ceph fs subvolume getpath cephfs staff csvg
> /volumes/csvg/staff/6a1b3de5-f6ab-4878-aea3-3c3c6f96ffcf
>
> [root@ceph1 ~]# ceph fs subvolume ls cephfs csvg
> [
> {
> "name": "staff"
> }
> ]
>
>
>
> --
> Sincerely,
>
>
> Matthew Melendy
>
> IT Services Specialist
> CS System Services Group
> FEC 3550, University of New Mexico
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