OPEN DATASET hangs

Hi,

We have the SAP server and a File server connected by NFS mount. We have the ABAP program which is reading the files on the File server. Sometimes the NFS mount goes down and the ABAP program hangs on the open dataset command for more then 6 to 7 hrs and we need to cancel the program in SM66 or in some other transaction. Is there a function module or any other method to see if the NFS mount is available before the OPEN DATASET statement.

Thanks For your help

Ram