I have 2 servers forms a cluster which exports NFS share to UNIX home.
It had been up and running for over 1 month now.
However, starting last week, the NFS share will stop responding to NFS
clients but no problem accessing from Windows' client.

I was try to migrate the volume to another server, but fail, I have to
restart the server in order for the second serve to take over the volume.

To restart server, I need to use debug mode or power off it, "down",
"reset server"... will just hang there.

Monitor showed the CPU is only 0-2% usage.

any idea?