[CentOS] NFS hard mount

From: Rita <rmorgan466 at gmail.com>

> My problem is we have many NFS servers and clients. The client mounts to
> the servers using /net/serverA/dirA. When server A is decommissioned all
> the clients hand on `df`. I was wondering if there is a clean way to
> unmount the server instead of rebooting clients (100+ clients). I am try
> doing a lazy unmount but that doesn't seem to fix the problem.

Why not ifup the decommissioned IP on another server/pc just long enough 
for the clients to umount?
I think you do not even need to have a nfs server listing on it...

JD