Chapter 16Managing Disk Use (Tasks)
This chapter describes how to optimize disk space by locating
unused files and large directories.
This is a list of the step-by-step instructions in this chapter.
Displaying Information About Files and Disk Space
This table summarizes the commands available for displaying information
about file size and disk space.
Command | Man Page | Description |
|---|
df | df(1M) | Reports the number of free disk blocks and files. |
du | du(1) | Summarizes disk space allocated to each subdirectory. |
find -size | find(1) | Searches recursively through a
directory based on the size specified with the -size option. |
ls -lh | ls(1) | Lists the size of a file in the
power of 1024. |
How to Display Information About Files and Disk Space
Display information about how disk space is used by using the df command.
$ df [directory] [-h] [-t] [-t]
|
df | With no options, lists all mounted
file systems and their device names, the number of 512-byte blocks used, and
the number of files. |
directory | Specifies the directory whose file
system you want to check. |
-h | Displays disk space in the power of
1024. |
-t | Displays the total blocks as well as
the blocks used for all mounted file systems. |
Examples--Displaying Information About File Size and Disk Space
In the following example, all the file systems listed are locally mounted
except for /usr/dist, which is mounted remotely from
the system venus.
$ df
/ (/dev/dsk/c0t0d0s0 ): 287530 blocks 92028 files
/usr (/dev/dsk/c0t0d0s6 ): 1020214 blocks 268550 files
/proc (/proc ): 0 blocks 878 files
/dev/fd (fd ): 0 blocks 0 files
/etc/mnttab (mnttab ): 0 blocks 0 files
/var/run (swap ): 396016 blocks 9375 files
/tmp (swap ): 396016 blocks 9375 files
/opt (/dev/dsk/c0t0d0s5 ): 381552 blocks 96649 files
/export/home (/dev/dsk/c0t0d0s7 ): 434364 blocks 108220 files
/usr/dist (venus:/usr/dist ):14750510 blocks 2130134 files
|
In the following example, file system information is displayed in 1024
bytes.
$ df -h
Filesystem size used avail capacity Mounted on
/dev/dsk/c0t0d0s0 1.9G 58M 1.8G 4% /
/dev/dsk/c0t0d0s6 2.5G 765M 1.7G 1% /usr
/proc 0K 0K 0K 0% /proc
fd 0K 0K 0K 0% /dev/fd
mnttab 0K 0K 0K 0% /etc/mnttab
swap 2.1G 24K 2.1G 1% /var/run
swap 2.1G 0K 2.1G 0% /tmp
/dev/dsk/c0t0d0s5 1.9G 12M 1.8G 1% /opt
/dev/dsk/c0t0d0s7 1.9G 10K 1.8G 1% /export/home
|
Note - Although /proc and /tmp
are local file systems, they are not UFS file systems. /proc
is a PROCFS file system, /var/run and /tmp are TMPFS file systems, and /etc/mnttab is
a MNTFS file system.
The following example shows a list of all mounted file systems, device
names, total 512-byte blocks used, and number of files. The second line of
each two-line entry displays the total number of blocks and files allocated
for the file system.
$ df -t
/ (/dev/dsk/c0t0d0s0 ): 287530 blocks 92028 files
total: 385614 blocks 96832 files
/usr (/dev/dsk/c0t0d0s6 ): 1020214 blocks 268550 files
total: 2381102 blocks 300288 files
/proc (/proc ): 0 blocks 879 files
total: 0 blocks 924 files
/dev/fd (fd ): 0 blocks 0 files
total: 0 blocks 72 files
/etc/mnttab (mnttab ): 0 blocks 0 files
total: 0 blocks 1 files
/var/run (swap ): 396112 blocks 9375 files
total: 396112 blocks 9395 files
/tmp (swap ): 396112 blocks 9375 files
total: 396128 blocks 9395 files
/opt (/dev/dsk/c0t0d0s5 ): 381552 blocks 96649 files
total: 385614 blocks 96832 files
/export/home (/dev/dsk/c0t0d0s7 ): 434364 blocks 108220 files
total: 434382 blocks 108224 files
/usr/dist (venus:/usr/dist ): 14750510 blocks 2130134 files
total: 41225162 blocks 2482176 files
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