sar -u : %wio

[j773303]

Does anyone has the experience about %wio is reachd 50-60%? Any problem occurs when %wio reached 60%? Thank.

[Nicolas Dumeige]

Hello,

I've seen wait IO like this when numerous clients were doing numerous queries on a small DB on a box with medium performance IO subsystem (16 disks).

Is there a database on the server ? If so, wich one ?

Cheers

Nicolas

[Ravi_8]

Hi,

system would get bit slow, for us this happens while doing transactions on databases. but no major damage.

[Naveej.K.A]

Hi,
It could create a bit of choke on your system and hence on your database if it reaches 60%. You could use the sar -d to get details of your individual disks, which could give you a better idea.

if the average of your data collected is 60% the system is not running fairly smooth (some choke ups with your I/O) that i what i would say.

regds
Naveej

with best wishes

[Bharat Katkar]

This an indication of mismatched speed of I/o Devices and Processor.

If this is really showing some performance setback then you need to check for Disk Bottleneck.
Though it looks like disk bottleneck, i would suggest you to monitor buffers and memory as well.

Try configuring those and see if this wio gets reduced.

[twang]

Hi,

Next step is to find out which device is the hot disk:
sar -d 5 20

regards tommy