On 09/05/2011 01:45 PM, Scott Marlowe wrote:
On Mon, Sep 5, 2011 at 8:08 AM, Gerhard Wohlgenannt<wohlg@xxxxxxxxxxx> wrote:
Below please find the results of vmstat 2 over some periode of time .. with
normal database / system load.
2 1 1344204 240924 104156 31462484 350 0 1906 234 3687 4512 12 3 77 9
Your IO Wait is actually pretty high. On an 8 core machine, 12.5%
means one core is doing nothing but waiting for IO.
My server is 2-core, so these numbers looked fine by me. I need to remember core count when I look at these.
So the line above, for 2 core's would not worry me a bit, but on 8 cores, it pretty much means one core was pegged (with 9% wait? Or is it one core was pegged, and another was 72% io wait?)
I have always loved the vmstat output, but its starting to get confusing when you have to take core's into account. (And my math was never strong in the first place :-) )
Good catch, thanks Scott.
-Andy
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