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11-25-2006 04:00 PM
11-25-2006 04:00 PM
The SAR & VMSTAT are showing Wait IO upto 28% when I run these utilities on server. However, glance and top are not showing io waits that high. Idle time in SAR averages around 40% whereas in TOP it is around 60 to 65%. I would like confirm which source is correct.
Thanks
All replies are appreciated.
Solved! Go to Solution.
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11-25-2006 05:11 PM
11-25-2006 05:11 PM
SolutionSorry, you probably can't confirm which source is correct.
sar and glance collect their data in different ways and at different intervals. Sometimes even the calculation methodology is a little different.
Therefore coming to a conclusion about which data is correct is probably impossible, since more than likely both data sets are correct based on the criteria I outlined above.
I don't have glance in all locations and try and use a standardized set of sar tools for this information, and they've never pointed me wrong as far as finding performance problems.
http://www.hpux.ws/system.perf.sh
Adjustable, runs background and thats production code I just posted up there, tried and tested world-wide.
SEP
Owner of ISN Corporation
http://isnamerica.com
http://hpuxconsulting.com
Sponsor: http://hpux.ws
Twitter: http://twitter.com/hpuxlinux
Founder http://newdatacloud.com
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11-25-2006 11:42 PM
11-25-2006 11:42 PM
Re: sar/vmstat vs glance
ps,top,sar,vmstat which use kernel counters (pstat). And obviously would suggest OVPA (former measureware) as a way to collect data and analyze later.
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11-26-2006 06:20 AM
11-26-2006 06:20 AM
Re: sar/vmstat vs glance
Bill Hassell, sysadmin
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11-27-2006 06:00 PM
11-27-2006 06:00 PM
Re: sar/vmstat vs glance
Thank You for your replies. The explanation did help understand the discrepencies.
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11-27-2006 06:02 PM
11-27-2006 06:02 PM