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MOUNT(8)							      MOUNT(8)

NAME
       mount, umount - mount and dismount filesystems

SYNOPSIS
       /usr/etc/mount [ -p ]
       /usr/etc/mount -a [ vd [ f | n ]] [ -t type ]
       /usr/etc/mount [ -rvd [ f | n ]] [ -t type ] [ -o options ] fsname dir
       /usr/etc/mount [ -vd [ f | n ]] [ -o options ] fsname | dir

       /usr/etc/umount [ -t type ] [ -h host ]
       /usr/etc/umount -a[v]
       /usr/etc/umount [ -v ] fsname | dir

DESCRIPTION
       The  mount command attaches a filesystem fsname to the file tree at the
       directory dir.  The directory dir may or may not already exist.	If dir
       already	exists,	 its  contents	are  hidden  until  the	 filesystem is
       unmounted, and dir becomes the name of  the  newly  mounted  root.   If
       fsname  is  of  the form host:path the filesystem type is assumed to be
       nfs.

       The umount command detaches the filesystem fsname previously mounted on
       directory  dir.	Either the filesystem name or the mounted-on directory
       may be used.

       The mount and umount commands maintain a table of  mounted  filesystems
       in  /etc/mtab,  described in mtab(5).  The mount command mounts entries
       onto the filesystem from data it	 finds	in  one	 of  two  places.   If
       NetInfo	is  running, it comes from netinfo(5).	Otherwise, the entries
       are stored in /etc/fstab(5).  Note that boot time mounts of type	 "4.3"
       filesystems  always  occur  before  NetInfo  is running, and so must be
       stored in /etc/fstab to be seen by the system.  If invoked  without  an
       argument,  mount	 displays  the	table from /etc/mtab.  If invoked with
       only one of fsname or dir mount searches the filesystem	table  for  an
       entry  whose  dir  or  fsname  field  matches  the given argument.  For
       example, if this line is in /etc/fstab:

	      /dev/sd1a /usr 4.3 rw 1 1

       then the commands mount /usr and mount /dev/sd1a are  short  for	 mount
       /dev/sd1a /usr

MOUNT OPTIONS
       -p     Print  the  list of mounted filesystems in a format suitable for
	      use in /etc/fstab.

       -a     Attempt to mount all the filesystems described in the filesystem
	      table.   (In  this  case,	 fsname	 and  dir  are	taken from the
	      filesystem  table.)   If	a  type	 is  specified	all   of   the
	      filesystems  in the filesystem table with that type are mounted.
	      Filesystems are not necessarily mounted in the order  listed  in
	      the table.

       -f     Fake  a  new  /etc/mtab  entry,  but  do	not actually mount any
	      filesystems.

       -n     Mount the filesystems without updating /etc/mtab.	 (This can  be
	      useful for recovering from an overly full disk.)

       -v     Verbose  —  mount	 displays  a message indicating the filesystem
	      being mounted.

       -d     Don't check if NFS mount appears to be mounting a	 directory  on
	      top  of  itself.	Otherwise, mount ignores such requests.	 Since
	      the NFS daemon on a machine might not have the  same  filesystem
	      root  as	the  mount  process, this option may be necessary in a
	      chroot'ed environment.

       -t     The next argument is the filesystem type.	  The  accepted	 types
	      are 4.3, nfs, dos, macintosh, and cfs (CD-ROM file system).  See
	      fstab(5) for a description of these filesystem types.

       -r     Mount the specified filesystem read-only.	 This is short for:

		     mount -o ro fsname dir

	      Physically write-protected and magnetic tape filesystems must be
	      mounted read-only, or errors occur when access times are updated
	      whether or not any explicit write is attempted.

       -o     Specify options, a list of comma-separated words from  the  list
	      below.   Some  options are valid for all filesystem types, while
	      others apply to a specific type only.

	      The following is a list of options valid	on  all	 file  systems
	      (the default is rw,suid if the filesystem is mounted by root and
	      rw,nosuid if the filesystem is not mounted by root):

	      rw     read/write.

	      ro     read-only.

	      suid   set-uid execution allowed (cannot be  specified;  default
		     if root mounts the filesystem).

	      nosuid set-uid execution not allowed.

	      noauto do not mount this file system automatically (mount -a).

	      remount
		     change  the  mount	 options  on  this file system without
		     unmounting it first.

	      options specific to nfs (NFS) file systems.  The defaults are:
		   fg,mnttimeo=20,retry=1,timeo=7,retrans=3,port=NFS_PORT,hard
	      The defaults for rsize and wsize set by the kernel.

	      bg     if	 the  first  mount  attempt  fails,   retry   in   the
		     background.

	      fg     retry in foreground.

	      mnttimeo=n
		     set mount timeout to n seconds.

	      retry=n
		     set number times to retry mount to n.

	      rsize=n
		     set read buffer size to n bytes.

	      wsize=n
		     set write buffer size to n bytes.

	      timeo=n
		     set NFS timeout to n tenths of a second.

	      retrans=n
		     set number of NFS retransmissions to n.

	      port=n set server IP port number to n.

	      soft   return  error  if server doesn't respond. Do not use this
		     option with the rw option.

	      hard   retry request until server responds.

	      intr   allow keyboard interrupts on hard mounts.

	      net    Tell the NFS automounter to recognize this as a "network"
		     mount.   The  mount command will ignore these entries and
		     allow the autonfsmount(8) to take	care  of  them.	  This
		     option allows one to create a uniform view of the network
		     from all machines.	 Typically, the mount point  specified
		     is	  "/Net".    A	 mount	of  the	 form  "mount  -o  net
		     MACHINE:PATH  /Net"  translates  to  "mount  MACHINE:PATH
		     /Net/MACHINE/PATH".   If  the  mount  is performed on the
		     machine serving the file system,  then  no	 actual	 mount
		     occurs.	Instead,  a  symbolic  link  is	 created  from
		     "/Net/MACHINE" to "/".

	      acregmin=n
		     set minimum time interval (in  seconds)  for  file	 entry
		     caching

	      acregmax=n
		     set  maximum  time	 interval  (in seconds) for file entry
		     caching

	      acdirmin=n
		     set minimum time interval for directory entry caching

	      acdirmax=n
		     set maximum time interval for directory entry caching

	      noac   set no file attribute caching

	      The bg option causes mount to  run  in  the  background  if  the
	      server's	mountd(8)  does	 not  respond.	 mount	attempts  each
	      request retry=n times before giving up.  Once the filesystem  is
	      mounted,	each  NFS  request  made  in  the kernel waits timeo=n
	      tenths of a second for a response.  If no response arrives,  the
	      time-out	is  multiplied	by 2 and the request is retransmitted.
	      When retrans=n retransmissions have been sent with  no  reply  a
	      soft  mounted  filesystem	 returns an error on the request and a
	      hard  mounted  filesystem	 prints	 a  message  and  retries  the
	      request.	 Filesystems  that  are mounted rw (read-write) should
	      use the hard option.  The intr option allows keyboard interrupts
	      to  kill a process that is hung waiting for a response on a hard
	      mounted filesystem.  The number of bytes	in  a  read  or	 write
	      request can be set with the rsize and wsize options.

       The  attribute  caching options can be used to defeat or modify client-
       side caching of attributes relating to objects accessed via NFS from  a
       server.	Changing these options can have a severe impact on the client-
       side performance of  an	NFS  filesystem.   A  typical  scenario	 where
       changing	  the	parameters   is	  beneficial  is  a  multi-workstation
       development  environment,  where	 multiple   clients   are   performing
       read/write file access to a common source file set.

UMOUNT OPTIONS
       -h host
	      Unmount  all  filesystems	 listed	 in /etc/mtab that are remote-
	      mounted from host.

       -a     Attempt to unmount all the filesystems currently mounted (listed
	      in /etc/mtab).  In this case, fsname is taken from /etc/mtab.

       -v     Verbose  —  umount  displays a message indicating the filesystem
	      being unmounted.

EXAMPLES
       mount /dev/sd1a /usr		      mount a local disk
       mount -ft 4.3 /dev/nd0 /		      fake an entry for nd root
       mount -at 4.3			      mount all 4.3 filesystems
       mount -t nfs serv:/usr/src /usr/src    mount remote filesystem
       mount serv:/usr/src /usr/src	      same as above
       mount -o hard serv:/usr/src /usr/src   same as above but hard mount
       mount -p > /etc/fstab		      save current mount state

FILES
       /etc/mtab table of mounted filesystems
       /etc/fstab     table of filesystems mounted at boot

SEE ALSO
       mount(2), unmount(2), fstab(5), mountd(8C), nfsd(8C), netinfo(5)

BUGS
       Mounting filesystems full of garbage crashes the system.

       If the directory on which a filesystem is to be mounted is  a  symbolic
       link,  the filesystem is mounted on the directory to which the symbolic
       link refers, rather than being mounted on  top  of  the	symbolic  link
       itself.

				October 8, 1990			      MOUNT(8)
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