[Samba] ceph_vms performance

[Thomas Bennett]

>
> Interesting. You might be able to improve the Samba vfs_ceph performance
> by tuning the Samba write cache size (although for SMB2 leases this
> isn't used).
>

Thanks Jeremy. I'll take a look at this. But my testing should hopefully
exclude any caching that might be happening.

Cheers,
Tom