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請問如何判斷系統的disk io是否為 performance bottleneck?

請問如何判斷系統的disk io是否為 performance bottleneck?

請問如何判斷系統的disk io是否為 performance bottleneck?
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請問如何判斷系統的disk io是否為 performance bottleneck?

A system is disk-bound if there is a large

amount of disk traffic on one or more disk

drives, and the CPU is spending a great deal of

time idle, waiting for disk I/Os to complete.



try to inspect your system with `top`,

`iostat`, `collect`, and `monitor`.

請問如何判斷系統的disk io是否為 performance bottleneck?

1. collect -d 看到的 %bsy 是很好的參考指標

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The following command specifies only data from the disk subsystem, and then only from specific disks identified as dsk0, dsk1, and dsk8. The disk names are determined by their device special file names in the /dev/disk directory. the disk names are entered on the command line separated by commas, with no blank spaces, as shown in this example:

# collect -sd -Ddsk0,dsk1,dsk8

Initializing (1.0 seconds) ... done.



The hwmgr command can also be used to find devices. See the hwmgr(8) reference page for information on the command options.

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2. 也可以安裝 sar, sar -d 的 %busy 也是觀察指標