I have a system mount between two servers , but sometimes the connection will be broken when the unstable network or reboot the server , then the mount will not be resumed , even I add the mount connection at /etc/inittab , I still found the mount connection is unstable , could suggest how can I make sure two servers are mounted at any time ? thx.

You can use a daemon like automounter. We use that in HPUX... There are many generic such daemons which will run and remount NFS filesystems.

You must put an entry in the /etc/fstab or /etc/vfstab or whatever your file is called. (where your mounted FS are located)

Then ensure that the automount program is running. And you need Rpc daemon running as well I think, at least on the client, if not on the host server.

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from my experience --- hard mounting NFS-filesystems will always get you this situation because any disconnection will create stale NFS connections ... the cleanest way I found to get rid of them is to reboot the affected server ... but this could be a problem if you have other servers dependent on the server that is being rebooted ... automounting will help you a lot if you really don't need that the NFS filesystems be permanently mounted based on an application requirement ...

see "man automount" ... and also the "Managing NFS and NIS" book in the O'reilly series ...