----- "Günter Zimmermann" guenter.zimmermann@gmx.at wrote:

Thank you for your reply. I could find just one process in D and this is a delayed resync from another raid device. It is delayed because of the big resync in progress. I think this is not the problem. Could the running resync cause the high loadavg without showing up i/o wait or cpu utilization in top?

It sure can. All of the D, R, and Zs count toward your load average. It looks like you should be somewhere approaching 8.