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  man pages->Tru64 Unix man pages -> mountdtab (4)              



NAME    [Toc]    [Back]

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

SYNOPSIS    [Toc]    [Back]


DESCRIPTION    [Toc]    [Back]

       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

       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    [Toc]    [Back]

       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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