[Bug 260011] Unresponsive NFS mount on AWS EFS

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=260011

--- Comment #6 from Rick Macklem <rmacklem@FreeBSD.org> ---
Oh, and my comment 2.r.t. don't run the nfscbd may
not be good advice. Here's a more complete answer:

The nfscbd(8) provides callback handling when it
is running.  Callbacks need to be working for the
server to issue delegations or layouts (the latter is
pNFS only).

When the nfscbd(8) is not running, the server should
work fine and never issue delegations or layouts.
It should set a flag in the reply to the Sequence
operation (the first one in each compound RPC)
called SEQ4_STATUS_CB_PATH_DOWN. This is an FYI
for the client.

I found another round of bugs related to delegations
during a recent IETF NFSv4 testing event. These are
fixed in stable/13, but not 13.0.
--> As such, delegations are problematic and you don't
    want them being issued.
    --> Don't run the nfscbd(8) daemon.
Unfortunately Amazon does not attend these testing
events, so what their server does is ??? for me.

However, if it is known that the Amazon EFS never
issues delegations or layouts (I believe cpercival@
said that was the case three years ago), then the
server might be broken and get "perterbed" by the
callbacks not working.
--> In this case, you should run the nfscbd daemon
    by setting nfscbd_enable="YES" in your /etc/rc.conf
    or start it manually.

And, given the above, I think you can see why my initial
advice was just "don't run it".

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