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System Administration Guide: Advanced Administration
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Document Information


1.  Managing Terminals and Modems (Overview)

2.  Setting Up Terminals and Modems (Tasks)

3.  Managing Serial Ports With the Service Access Facility (Tasks)

4.  Managing System Resources (Overview)

5.  Displaying and Changing System Information (Tasks)

6.  Managing Disk Use (Tasks)

7.  Managing UFS Quotas (Tasks)

8.  Scheduling System Tasks (Tasks)

9.  Managing System Accounting (Tasks)

10.  System Accounting (Reference)

11.  Managing System Performance (Overview)

12.  Managing System Processes (Tasks)

13.  Monitoring System Performance (Tasks)

Displaying System Performance Information (Task Map)

Displaying Virtual Memory Statistics (vmstat)

How to Display Virtual Memory Statistics (vmstat)

How to Display System Event Information (vmstat -s)

How to Display Swapping Statistics (vmstat -S)

How to Display Interrupts Per Device (vmstat -i)

Displaying Disk Utilization Information (iostat)

How to Display Disk Utilization Information (iostat)

How to Display Extended Disk Statistics (iostat -xtc)

Displaying Disk Space Statistics (df)

How to Display Disk Space Information (df -k)

Monitoring System Activities (Task Map)

Monitoring System Activities (sar)

How to Check File Access (sar -a)

How to Check Buffer Activity (sar -b)

How to Check System Call Statistics (sar -c)

How to Check Disk Activity (sar -d)

How to Check Page-Out and Memory (sar -g)

Checking Kernel Memory Allocation

How to Check Kernel Memory Allocation (sar -k)

How to Check Interprocess Communication (sar -m)

How to Check Page-In Activity (sar -p)

How to Check Queue Activity (sar -q)

How to Check Unused Memory (sar -r)

How to Check CPU Utilization (sar -u)

How to Check System Table Status (sar -v)

How to Check Swapping Activity (sar -w)

How to Check Terminal Activity (sar -y)

How to Check Overall System Performance (sar -A)

Collecting System Activity Data Automatically (sar)

Running the sadc Command When Booting

Running the sadc Command Periodically With the sa1 Script

Producing Reports With the sa2 Shell Script

Setting Up Automatic Data Collection (sar)

How to Set Up Automatic Data Collection

14.  Troubleshooting Software Problems (Overview)

15.  Managing System Messages

16.  Managing Core Files (Tasks)

17.  Managing System Crash Information (Tasks)

18.  Troubleshooting Miscellaneous Software Problems (Tasks)

19.  Troubleshooting File Access Problems (Tasks)

20.  Resolving UFS File System Inconsistencies (Tasks)

21.  Troubleshooting Software Package Problems (Tasks)


Displaying Disk Space Statistics (df)

Use the df command to show the amount of free disk space on each mounted disk. The usable disk space that is reported by df reflects only 90 percent of full capacity, as the reporting statistics allows for 10 percent above the total available space. This head room normally stays empty for better performance.

The percentage of disk space actually reported by the df command is used space divided by usable space.

If the file system exceeds 90 percent capacity, you could transfer files to a disk that is not as full by using the cp command. Alternately, you could transfer files to a tape by using the tar or cpio commands. Or, you could remove the files.

For a detailed description of this command, see the df(1M) man page.

How to Display Disk Space Information (df -k)

Example 13-4 Displaying File System Information

The following example shows the output from the df -k command.

$ df -k
Filesystem            kbytes    used   avail capacity  Mounted on
/dev/dsk/c0t0d0s0     254966  204319   25151    90%    /
/devices                   0       0       0     0%    /devices
ctfs                       0       0       0     0%    /system/contract
proc                       0       0       0     0%    /proc
mnttab                     0       0       0     0%    /etc/mnttab
swap                  496808     376  496432     1%    /etc/svc/volatile
objfs                      0       0       0     0%    /system/object
/dev/dsk/c0t0d0s6    3325302 3073415  218634    94%    /usr
fd                         0       0       0     0%    /dev/fd
swap                  496472      40  496432     1%    /var/run
swap                  496472      40  496432     1%    /tmp
/dev/dsk/c0t0d0s5      13702    1745   10587    15%    /opt
/dev/dsk/c0t0d0s7       9450    1045    7460    13%    /export/home

The following table describes the output of the df -k command.

Field Name
Total size of usable space in the file system
Amount of space used
Amount of space available for use
Amount of space used, as a percentage of the total capacity
mounted on
Mount point