Disks exist in Unix as physical volumes and are carved into physical partitions (PPs). These physical partitions are, in turn, assigned to logical volumes. A logical volume is a chunk of storage that consists of one or more physical partitions. The logical volumes are then mapped onto Unix mount points. Several logical volumes can be used in a mount point, and a collection of such logical volumes is referred to as a volume group. A Unix mount point is like a directory name, and is used by you, the Oracle DBA, when allocating Oracle data files.
All logical volumes can be listed in HP-UX using the df -k command. The df -k command shows each logical volume, and the corresponding mount point. For example:
df -k/home(/dev/vg00/lvol5): 20166 total allocated Kb 4945 free allocated Kb 15221 used allocated Kb 75 % allocation used /opt (/dev/vg00/lvol6):615914 total allocated Kb 227403 free allocated Kb 388511 used allocated Kb 63 % allocation used /tmp (/dev/vg00/lvol4):64215 total allocated Kb 20564 free allocated Kb 43651 used allocated Kb 67 % allocation used /u01 (/dev/vg01/u01 ):17580720 total allocated Kb 12117048 free allocated Kb 5463672 used allocated Kb 31 % allocation used
The df -k command is most often used to see the total space in each mount point and the amount of free space within each mount point. In the previous example, you see that /u01 is defined with a size of 17 gigabytes, and has 12 gigabytes free.
The mount point ...