Client Mount Card dead issue record on NFS

System environment: CENTOS5 version and centOS6 version

Version of client: nfs-utils-1.2.3

The default parameters are used for mounting.

Abnormal phenomenon:

When an exception occurs on the NFS server, the client mount will continue to attempt to connect to the NFS server, causing the client to die when using the DF command to display the mounted file system, sometimes using CTRL + C To resolve it, perhaps because the Mount directory is not occupied, and then the load gradually increases. Until the entire machine does not provide services, performance is high iostat.

Attached: This happens when the NFS server itself mounts itself and resumes after restarting the servers.

Try the following method, still invalid:

(1) Use lsof mount directory, no file occupies, fuser-k mount directory, display busy, cannot uninstall.

(2) Umount-f mount directory, no use.

Extended:

When mounting a parameter that uses a soft mount or setting a failed re-attached parameter, there is still a problem and there seems to be no workaround.

Client Mount Card dead issue record on NFS