Files served via NFS vanishing

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http://www.linuxquestions.org – I am having an interesting problem. I use NFS to serve up my media files to all the other machines on my network. What I am seeing is if a client has the NFS directories mounted for a couple of hours, files will start "vanishing" from what is being served up. The files are still there on the server. The client can no longer see them. The only way to make them viewable to the client again is to unmount the directory on the client and then remount it. This is a pain. What is happening? How can I fix this? (HowTos)