How can I identify the I/O bottleneck?

[yongye_2]

Hi,

For monitor disk I/O, Which tool should I use iostat, sar, or vxstat? And how can I know there are bottleneck on the disk? Is there any recommended value to identify bottleneck for disk I/O?

Thanks in advanced,

Yongye

[Pedro Cirne]

Hi,

Try sar -d 5 10.

If a device is busy more than 30/40% of the time, then probably you have a bottleneck there.

Enjoy :)

Pedro

[Mahesh Kumar Malik]

Hi Yongye

You may use sar to get info on IO utilisation. IO budy of more than 30% in sar output shows IO bottlenecks.

Alternatively Glance is a good tool to capture IO performance in the systems

Regards
Mahesh

[Adisuria Wangsadinata_1 · Accepted solution]

Hi Yongye,

Check the url below about 'Determining the Cause of System Performance Problems' (docID : KBRC00014838) :

http://www1.itrc.hp.com/service/cki/docDisplay.do?docLocale=en_US&docId=200000073548851

If you have Glance, this is a good software to monitoring the performance of the system.

Hope this information can help you.

Cheers,
AW

[yongye_2]

Hi,

Thank you for your help. It really give me a good understanding on disk I/O monitor.

Yongye