Unix Guide Page 14

14. Mounting

mount will create a file structure (syntax- mount [where to mount]/mnt, i.e. mount /dev/dsk/c0t1d0s0/mnt)

umount /mnt – takes the files and directories and hides them until you mount them So you would remount by mount [device name] [where you want it to go], i.e. mount /dev/dsk/c0t1d0s0 /export/home/mine

All directories and files are mounted on the partitions

Mount is a hook for everything else to attach the first time. Mount ties everything together like /etc to / (root) and so on, kind of like a pyramid, where root is the apex, and the files go down from there all hooked together.

Rules for mounting
Mount point must exist
Directory can’t be busy
- things make a directory busy
  - r – root directory
  - c – current directory
  - o – open file
  - t – text image (any program running)
  - l – l not 2 file systems(fs) on 1 directory, and not 1 fs on 2 directories

Rules for unmounting

Mount point must be mounted
File system can’t be busy
File system must not contain mount points

The fuser –c [dir name] will tell who is using the directory

Steps to set up a new disk and to free up space:

format to partition

newfs to create file system on new partition

mount file system to temporary place

cp (copy) old location to temporary directory

rmdir (delete) old copy (if freeing up space)

umount from temp location

mount file system on old location (like linking, except you are putting info on new physical device but making it look the same in the tree, /etc/vfstab is a database for doing this)

In mount option field put re (read-only), nosuid (no setting user id),example: mount[device to mount] [device to fsck] [mount point] [file type] [fsck pass any number but 1] [ mount at boot?] [mount options] i.e. mount /dev/dsk/c0t1d0s0 /dev/dsk/c0t1d0s0 /export/home/paul ufs 5 yes nosuid

Mount has two arguments: mount [physical gear to mount] [mount point] i.e. mount /dev/dsk/c0t0d0s0 /etc/usr

vfstab no blank lines

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