How to Display Extended Disk Statistics (iostat -xtc)
Run the iostat -xtc command to get extended disk statistics.
$ iostat -xtc
extended device statistics tty cpu
device r/s w/s kr/s kw/s wait actv svc_t %w %b tin tout us sy wt id
fd0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0 0 0 0 0 0 0 100
sd0 0.0 0.0 0.4 0.4 0.0 0.0 49.5 0 0
sd6 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0 0
nfs1 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0 0
nfs49 0.0 0.0 0.0 0.0 0.0 0.0 15.1 0 0
nfs53 0.0 0.0 0.4 0.0 0.0 0.0 24.5 0 0
nfs54 0.0 0.0 0.0 0.0 0.0 0.0 6.3 0 0
nfs55 0.0 0.0 0.0 0.0 0.0 0.0 4.9 0 0
|
The iostat -xtc command displays a line of output for each disk. The output fields are described in the following table.
Table 24–5 Output From the iostat -xtc Command|
Field Name |
Description |
|---|---|
|
r/s |
Reads per second |
|
w/s |
Writes per second |
|
kr/s |
Kbytes read per second |
|
kw/s |
Kbytes written per second |
|
wait |
Average number of transactions that are waiting for service (queue length) |
|
actv |
Average number of transactions that are actively being serviced |
|
svc_t |
Average service time, in milliseconds |
|
%w |
Percentage of time that the queue is not empty |
|
%b |
Percentage of time that the disk is busy |
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