On Mon, Nov 01, 2021 at 12:22:15PM -0700, dai.ngo@xxxxxxxxxx wrote: > > On 11/1/21 12:02 PM, Steve Dickson wrote: > > > > > >On 11/1/21 11:40, J. Bruce Fields wrote: > >>On Mon, Nov 01, 2021 at 11:30:48AM -0400, Steve Dickson wrote: > >>>Now that cp will use copy_file_range() when available, > >>>what are the steps needed to enable these fast copies? > >> > >>1) Make sure client and both servers support NFSv4.2 and > >>server-to-server copy. > >Something is already figuring this out... The only time > >the client sends a COPY_NOTIFY and COPY is when both > >mounts are 4.2. I have not looked into but that is what > >the network traces are showing. Right. I was thinking what I'd tell an admin who wanted to set up server-to-server copy. The first thing they'd need to do was check that their clients and servers were new enough. > >>2) Make sure destination server can access (at least for read) any > >>exports on the source that you want to be able to copy from. > >How can one server know what the other server has exported > >or access to?? And the second is to make sure that the destination server is able to read from the source. > >>3) echo 1 >/sys/module/nfsd/parameters/inter_copy_offload_enable on the > >>destination server. > >Who would be doing this? Plus this would not survive over a reboot. > >An export would as well a /etc/modprobe.d/ file. > > You can add a line in /etc/modprobe.d/nfsd.conf: > > options nfsd inter_copy_offload_enable=Y > > to enable the option. Yep, it would be better to document it that way, thanks. --b.
