On Tue, Jun 6, 2023 at 4:30 PM Dario Graña <[email protected]> wrote: > Hi, > > I'm installing a new instance (my first) of Ceph. Our cluster runs > AlmaLinux9 + Quincy. Now I'm dealing with CephFS and quotas. I read > documentation about setting up quotas with virtual attributes (xattr) and > creating volumes and subvolumes with a prefixed size. I cannot distinguish > which is the best option for us. >
Creating a volume would create a fs and subvolumes are essentially directories inside the fs which are managed through mgr subvolume APIs. The subvolumes are introduced for openstack and openshift use case which expect these subvolumes to be programmatically managed via APIs. Answering the quota question, in cephfs, quota is set using the virtual xattr. The subvolume creation with size essentially uses the same virtual xattr interface to set the quota size. > Currently we create a directory with a project name and some subdirectories > inside. > You can explore subvolumegroup and subvolume mgr APIs if it fits your use case. Please note that it's mainly designed for openstack/openshift kind of use cases where each subvolume is per PVC and the data distinction is maintained e.g., there won't be hardlinks created across the subvolumes. > I would like to understand the difference between both options. > > Thanks in advance. > > -- > Dario Graña > PIC (Port d'Informació Científica) > Campus UAB, Edificio D > E-08193 Bellaterra, Barcelona > http://www.pic.es > Avis - Aviso - Legal Notice: http://legal.ifae.es > _______________________________________________ > ceph-users mailing list -- [email protected] > To unsubscribe send an email to [email protected] > _______________________________________________ ceph-users mailing list -- [email protected] To unsubscribe send an email to [email protected]
