mount(NADM) 19 June 1992 mount(NADM) Name mount - mount, umount - mount and unmount filesystems and remote resources Syntax /etc/mount [-v] [-r] [-f fstyp ] special directory /etc/mount [-r] [-c resource directory /etc/mount /etc/umount special /etc/umount directory /etc/umount resource Description Filesystems other than root ``/'' are considered removable in the sense that they can be either available to users or unavailable. mount announces to the system that special, a block special device, or resource, a remote resource, is available to users from the mount point directory. directory must exist already; it becomes the name of the root of the newly mounted special or resource. A unique resource may be mounted only once (no multiple mounts). mount, when entered with arguments, adds an entry to the table of mounted devices, /etc/mnttab. umount removes the entry. If invoked with no arguments, mount prints the entire mount table. If invoked with any of the following partial argument lists, mount will search /etc/default/filesys to fill in the missing arguments: special, resource, directory, or directory. The following options are available: -r indicates that special or resource is to be mounted read-only. If special or resource is write-protected or read-only adver- tised, this flag must be used. -v displays mount information verbosely -c indicates that remote reads and writes should not be cached in the local buffer pool. -c is used in conjunction with -d. -ffstyp indicates that fstyp is the filesystem type to be mounted. If this argument is omitted, it defaults to the root fstyp. If fstyp is NFS, then any NFS options may be added after the fstyp, separated by commas. The available NFS options are: soft return error if the server does not respond nosuid ignore setuid and setgid bits during exec bg background this mount. (This is recommended for automatic mounts done during system startup.) rsize=n set the read buffer size to n bytes wsize=n set the write buffer size to n bytes timeo=n set the initial NFS timeout to n tenths of a second. The default is 300 seconds. retrans=n set the number of NFS retransmissions to n. The default is 5. port=n set the server IP port number to n noac don't cache attributes. This is required when close syn- chronization with the server is required. BEWARE: use of this option will drastically cut performance on the file- system being mounted. special indicates the block special device that is to be mounted on directory. If fstyp is NFS, then special should be of the form hostname:/pathname. resource indicates the remote resource name that is to be mounted on a directory directory indicates the directory mount point for special or resource. (The directory must already exist.) umount announces to the system that the previously mounted special or resource is to be made unavailable. If invoked with special or direc- tory, umount will search /etc/default/filesys to fill in the missing argument(s). mount can be used by any user to list mounted filesystems and resources. Only a super-user can mount and umount filesystems. Files /etc/mnttab mount table /etc/default/filesys filesystem table See also setmnt(ADM), mountd(NADM), nfsd(NADM), showmount(NADM), mount(ADM), umount(ADM), mnttab(F) Diagnostics If the mount system call fails, mount prints an appropriate diagnostic. mount issues a warning if the filesystem to be mounted is currently labeled under another name. umount fails if special or resource is not mounted or if it is busy. special or resource is busy if it contains an open file or some user's working directory. Warnings Physically removing a mounted filesystem diskette from the diskette drive before issuing the umount command damages the filesystem.