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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	dae-
  mon makes an entry in	the server machine's mountdtab file.  The umount com-
  mand 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:


  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

  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 errone-
  ous 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)