Hi, Since quite a long time now, we observe the same phenomenon on threeweb servers we have on two different places. They regularly have high load peaks, until 20 to 50. These peaks append very regularly(from once a day to several an hour), and we can't explain why. It doesn't seem to be linked to a special increase in traffic or web requests. Two of the three servers are load-balanced web frontends running apache with nfs mounts. The third is an autonomous server with web, mail, mysql… services, without nfs. The three run under Debian Lenny. I know nobody could really solve this problem without access to the machines and logs, but I wonder if someone already experienced this sort of regular load peaks. Thanks in advance for any help,
Try installing sysstat, and use the iostat utility to check your disk's usage during those peaks. High load is caused from high cpu utilization, and from I/O util.
Try also to stop cron for several hours, in order to be sure that no cron job causes the load.
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