Re: Killing process in D state on mount to dead NFS server.

[Malahal Naineni <malahal@us.ibm.com>]

Ben Greear [greearb@candelatech.com] wrote:
> So, this has been asked all over the interweb for years and years, but
> the best answer I can find is to reboot the system or create a fake NFS
> server somewhere with the same IP as the gone-away NFS server.
> 
> The problem is:
> 
> I have some mounts to an NFS server that no longer exists (crashed/powered down).
> 
> I have some processes stuck trying to write to files open on these mounts.
> 
> I want to kill the process and unmount.
> 
> umount -l will make the mount go a way, sort of.  But process is still hung.
> umount -f complains:
>   umount2:  Device or resource busy
>   umount.nfs: /mnt/foo: device is busy
> 
> kill -9 does not work on process.
> 
> 
> Aside from bringing a fake NFS server back up on the same IP, is there any
> other way to get these mounts unmounted and the processes killed without
> rebooting?

You don't need a fake NFS server, you just need a fake or real server
with that IP address.  A popular way is to alias that IP on the NFS
client itself.

See the second popular answer below:
http://stackoverflow.com/questions/40317/force-unmount-of-nfs-mounted-directory

Regards, Malahal.