On Monday 16 March 2009, Joe Uhl <joeuhl(at)gmail(dot)com> wrote:
> Right now (not under peak load) this server is running at 68% CPU
> utilization and its SATA raid 10 is doing about 2MB/s writes and 11MB/
> s reads. When I run dd I can hit 200+MB/s writes and 230+ MB/s reads,
> so we are barely using the available IO. Further when I run dd the
> CPU utilization of that process only approaches 20%-30% of one core.
What does vmstat say when it's slow? The output of "vmstat 1 30" would be
informative.
note: dd is sequential I/O. Normal database usage is random I/O.
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