I have read the archives and the most recent discussion was 5 years ago. So I better ask again.
My NAS runs Centos with NFS4.2 (and I am testing Ganesha in another server)
Does Ovirt 4.3.4 have support for NFS 4/4.1/4.2 or pNFS
We support NFS 4.2 for a while (4.2 or 4.3), but the default is still auto (typically NFS 3).
Specially version 4.2 due to:
Server-Side Copy: NFSv4.2 supports copy_file_range() system call, which allows the NFS client to efficiently copy data without wasting network resources.
qemu support copy_file_range since RHEL 7.6, but I think it has some issues and does not perform well, and we don't enable this mode yet.
What work with NFS 4.2 is sparseness and fallocate support, speeding copy/move/clone/upload of spares disks.
For example creating 100g preallocated image would take less than a second.
But this will only happen if the Ovirt (which I know is Centos based) supports NFS 4.2.
Not sure If I update the NFS toolset on the Ovirt install, it will break something or worst.
It should work and much better.
Nir