mountdtab man page on OSF1

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mountdtab(4)							  mountdtab(4)

       mountdtab - Table of local file systems mounted by remote NFS clients


       The mountdtab file resides in the /etc directory and contains a list of
       all remote hosts that have mounted local file  systems  using  the  NFS
       protocols.   Whenever  a	 client	 performs  a  remote mount, the server
       machine's mount daemon makes an entry in the server machine's mountdtab
       file.  The umount command instructs the server's mount daemon to remove
       the entry.  The umount -b command broadcasts to all servers and informs
       them  that they should remove all entries from mountdtab created by the
       sender of the broadcast message.	 By placing an umount -b command in  a
       system  startup	file, mountdtab tables on NFS servers can be purged of
       entries made by a crashed client, who, upon rebooting, did not  remount
       the  same  file	systems	 that it had before the system crashed.	 Tru64
       UNIX systems automatically call umount -b at system startup

       The format for entries in the  mountdtab	 file  is  as  follows:	 host‐
       name:directory  Rather  than  rewrite the mountdtab file on each umount
       request, the mount daemon comments out unmounted entries by  placing  a
       number  sign  (#)  in  the  first character position of the appropriate
       line.  The mount daemon rewrites the entire file, without commented out
       entries,	 no  more  frequently  than  every  30 minutes.	 The frequency
       depends on the occurrence of umount requests.

       The mountdtab table  is	used  only  to	preserve  information  between
       crashes	and  is read only by the mountd daemon when it starts up.  The
       mountd daemon keeps an in-core table, which it uses to handle  requests
       from programs like showmount and shutdown.

       Although	 the  mountdtab	 table	is  close to the truth, it may contain
       erroneous information if NFS client machines fail to execute  a	umount
       -a command when they reboot.

       mount(8), umount(8), mountd(8), showmount(8), shutdown(8) delim off

                             _         _         _ 
                            | |       | |       | |     
                            | |       | |       | |     
                         __ | | __ __ | | __ __ | | __  
                         \ \| |/ / \ \| |/ / \ \| |/ /  
                          \ \ / /   \ \ / /   \ \ / /   
                           \   /     \   /     \   /    
                            \_/       \_/       \_/ 
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