On Wed, 17 Jan 2007, Sevrin Robstad wrote:

> I'm suffering from bad performance on my RAID5.
> 
> a "echo check >/sys/block/md0/md/sync_action"
> 
> gives a speed at only about 5000K/sec , and HIGH load average :
> 
> # uptime
> 20:03:55 up 8 days, 19:55,  1 user,  load average: 11.70, 4.04, 1.52

iostat -kx /dev/sd? 10  ... and sum up the total IO... 

also try increasing sync_speed_min/max....

and a loadavg jump like that suggests to me you have other things 
competing for the disk at the same time as the "check".

-dean
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