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тАО08-10-2005 04:46 AM
тАО08-10-2005 04:46 AM
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
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тАО08-10-2005 04:50 AM
тАО08-10-2005 04:50 AM
Re: How can I identify the I/O bottleneck?
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
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тАО08-10-2005 08:41 PM
тАО08-10-2005 08:41 PM
Re: How can I identify the I/O bottleneck?
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
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тАО08-10-2005 09:11 PM
тАО08-10-2005 09:11 PM
SolutionCheck 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
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тАО08-10-2005 09:22 PM
тАО08-10-2005 09:22 PM
Re: How can I identify the I/O bottleneck?
Thank you for your help. It really give me a good understanding on disk I/O monitor.
Yongye