Re: Puzzling full database lock

[Christopher Opena <counterveil@xxxxxxxxx>]

Do you mean 6-12% of total iowait, or per cpu?  Our average iowait in the last week is 34.31% of a total 1600% with an average idle of 1451.76%.  Our iowait *does* spike occasionally (today it went up to 148.01%) but it doesn't coincide with the lock happening.  At the time of the lock we were at 10.58% iowait, which is quite a bit below our average.

Thanks,

-Chris. 

On Wed, Feb 1, 2012 at 4:55 PM, Alan Hodgson <ahodgson@xxxxxxxxx> wrote:

Define "low I/O". The only things I've ever seen interfere with console access
are running out of memory or excessive disk i/o. If you're seeing even 6-12%
iowait on a 16 core machine you might very well have swamped your available
disk I/O.


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