How to Display Disk Utilization Information (iostat)
You can display disk utilization information by using the iostat command with a time interval in seconds.
$ iostat 5
tty fd0 sd3 nfs1 nfs31 cpu
tin tout kps tps serv kps tps serv kps tps serv kps tps serv us sy wt id
0 1 0 0 410 3 0 29 0 0 9 3 0 47 4 2 0 94
|
The first line of output shows the statistics since the last time the system was booted. Each subsequent line shows the interval statistics. The default is to show statistics for the terminal (tty), disks (fd and sd), and CPU (cpu).
The following table describes the fields in the iostat command output.
Table 24–4 Output From the iostat n Command|
Device Type |
Field Name |
Description |
|---|---|---|
|
Terminal |
|
|
|
|
tin |
Number of characters in the terminal input queue |
|
|
tout |
Number of characters in the terminal output queue |
|
Disk |
|
|
|
|
bps |
Blocks per second |
|
|
tps |
Transactions per second |
|
|
serv |
Average service time, in milliseconds |
|
CPU |
|
|
|
|
us |
In user mode |
|
|
sy |
In system mode |
|
|
wt |
Waiting for I/O |
|
|
id |
Idle |
Example—Displaying Disk Utilization Information
The following example shows disk statistics that were gathered every five seconds.
$ iostat 5 tty sd0 sd6 nfs1 nfs49 cpu tin tout kps tps serv kps tps serv kps tps serv kps tps serv us sy wt id 0 0 1 0 49 0 0 0 0 0 0 0 0 15 0 0 0 100 0 47 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 100 0 16 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 100 0 16 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 100 0 16 44 6 132 0 0 0 0 0 0 0 0 0 0 0 1 99 0 16 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 100 0 16 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 100 0 16 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 100 0 16 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 100 0 16 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 100 0 16 3 1 23 0 0 0 0 0 0 0 0 0 0 0 1 99 0 16 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 100 0 16 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 100 0 16 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 100 |
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