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wio ratio is very high

smkhairnar
Occasional Contributor

wio ratio is very high

Hi.......
what is exact meaning of waiting input output ratio (wio) & whats will impact on the server if wio ration is more than 60% ?????

What is solution for decrease the wio ratio ?

Pls help...........
6 REPLIES
SoorajCleris
Honored Contributor

Re: wio ratio is very high

Hi,

Coudl you please paste the output here?

Regards,
Sooraj
"UNIX is basically a simple operating system, but you have to be a genius to understand the simplicity" - Dennis Ritchie
smkhairnar
Occasional Contributor

Re: wio ratio is very high


hi i could not sent the sar output but its always below

22:56:50 %usr %sys %wio %idle
22:57:20 12 14 56 18

so pls suggest
Wim Rombauts
Honored Contributor

Re: wio ratio is very high

This means that your system has a serious IO bottleneck, that you should investigate.
WIO means your system is doing nothing, because it needs IO to be done to continue.
-> Has the system enough memory available,or is it swapping ? (use "swapinfo -tm")
-> Is it running an application that reads/writes a lot of data ? Maybe a few disks are overloaded (use "sar -d" or "gpm")

If you can make your IO more efficient, your application respons times may improve significantly.
SoorajCleris
Honored Contributor

Re: wio ratio is very high

Hi ,

Could you please paste the output of

sar -d 1 10
sar -b 1 10
swapinfo -tam

Do you have glance installed?

Which is the os version? what is the patch level?

Regards,
Sooraj
"UNIX is basically a simple operating system, but you have to be a genius to understand the simplicity" - Dennis Ritchie
Lee, Jones
Occasional Advisor

Re: wio ratio is very high

Hi,
Can ask more detail regrading the %wio? What is the difference between %wio and %idle? Both of them seems indicate CPU is doing nothing. Thanks for your advice.
BR
Jones Lee
Suraj K Sankari
Honored Contributor

Re: wio ratio is very high

Hi,

See the man page of sar to know wio and idle.

Suraj