Hi, On Fri, May 24, 2002 at 02:17:35PM -0400, Andreas Jung wrote: > That's right but we see these spikes sometimes over a period of 3-4 hours. > And there is only a moderate disk IO during that time of about 2GB/hour > since > the squids have a very high overall highrate of 96% (50% memory hits). Sounds as if one particular process is getting stuck in D state for an extended length of time. "ps aux" will show the state of all processes --- wait for a spike, then run a few ps runs to see if there is a process continually in that state. Cheers, Stephen