Hello,

I used Ovirt with Ganesha and PNFS (on Gluster not managed by OVirt).

I'm now using a Storage based in Linux on ZFS and kernel NFS using NFS Version 4.2. Thinprovisioning and trim on VM Disk's works fine so that VM Disk (Sparse Files on NFS) shrink when trimming inside VM. You have to check "Enable Discard" on VM Disks. Disks are created in a few seconds as stated.

Bye

On Sat, Jul 13, 2019, 00:30 Erick Perez <eperez@quadrianweb.com> wrote:

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

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