On 11/1/21 15:25, J. Bruce Fields wrote:
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.
Well the code went in over two years ago
ce0887ac96d35 (Olga Kornievskaia 2019-10-09 11:50:48 -0400 1663)
so most modern kernel will have the feature.
The real question is does the cp command have the
copy_file_range() support which didn't go in until
Mar of this year
* Wed Mar 24 2021 Kamil Dudka <kdudka@xxxxxxxxxx> - 8.32-20
- cp: use copy_file_range if available
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.
Yes... This is what I meant by "a /etc/modprobe.d/ file"
Yep, it would be better to document it that way, thanks.
But the question is who would create this file?
nfs-utils or the admin?
If it is nfs-utils, it is a global switch unbeknown by
the admin (but documented). If by the admin, the person
would know about but it still will not documented.
With a export option, it would be per export switch
and documented. Just saying... :-)
steved.
