Hi Eric,
Currently, Open MPI does not provide specific support for CephFS.
MPI-IO is either implemented by ROMIO (imported from MPICH, it does not
support CephFS today)
or the "native" ompio component (that also does not support CephFS today).
A proof of concept for CephFS in ompio might not be a huge work for
someone motivated:
That could be as simple as (so to speak, since things are generally not
easy) creating a new fs/ceph component
(e.g. in ompi/mca/fs/ceph) and implement the "file_open" callback that
uses the ceph API.
I think the fs/lustre component can be used as an inspiration.
I cannot commit to do this, but if you are willing to take a crack at
it, I can create such a component
so you can go directly to implementing the callback without spending too
much time on some Open MPI internals
(e.g. component creation).
Cheers,
Gilles
On 11/29/2022 6:55 AM, Eric Chamberland via users wrote:
Hi,
I would like to know if OpenMPI is supporting file creation with
"striping_factor" for CephFS?
According to CephFS library, I *think* it would be possible to do it
at file creation with "ceph_open_layout".
https://github.com/ceph/ceph/blob/main/src/include/cephfs/libcephfs.h
Is it a possible futur enhancement?
Thanks,
Eric
