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mountdtab(4)
NAME
  mountdtab - Table of local file systems mounted by remote NFS clients

SYNOPSIS
  /etc/mountdtab

DESCRIPTION
  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:

       hostname: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.

RESTRICTIONS
  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.

RELATED INFORMATION
  mount(8), umount(8), mountd(8), showmount(8), shutdown(8)

Index for Section 4

Alphabetical listing for M

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