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It is very difficult to escape from this situation in RHEL 6 and derivatives without rebooting the server.
Some specific instances have been: # grep server./proc/mounts server.example.com:/export /mnt nfs4 rw,relatime,vers=4,rsize=131072,wsize=131072,namlen=255,hard,proto=tcp,port=0,timeo=600,retrans=2,sec=sys,clientaddr=x.x.x.x,minorversion=0,local_lock=none,addr=y.y.y.y 0 0 # grep "server.example.com" /var/log/messages Sep 29 client kernel: nfs: server server.not responding, still trying Sep 29 client kernel: nfs: server server.OK Once the problem is isolated, further troubleshooting is required to fix the problem, and is beyond the scope of this solution.
NOTE: Any tcpdump capture should only contain packets involving the problematic NFS server.
If using tcpdump, you can accomplish this by using the 'host' and providing the NFS server name or IP address from the "not responding" message.
Investigate connectivity issues such as network link down, network packet loss, system hang, NFS client/server hang or slowness, storage hang or slowness.
The team responsible for the network between NFS Client and NFS Server should be engaged to investigate connectivity and capacity issues.