On 6 Jul 2022, at 19:57, jie wang wrote:

If execute "sm-notify -f -v ip2", sm-notify did not send the notify 
request.

Hmm, maybe its a bug?  You can turn up debugging with the "-d" opt, 
adding
more increases vebosity.  Try using three of them:

sm-notify -ddd -f -v ip2

Have you tried looking at an strace?  Are there different values set for
sm-notify in your nfs.conf file?

Check out the source, perhaps sm-notify isn't going to be able to send a
notification for an address that doesn't exist on a local network 
adapter
(this is a common pattern), and you need to configure that ip address as 
an
additional address on your system?

These are guesses.

Ben