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Server lags randomly

Discussion in 'Plesk for Linux - 8.x and Older' started by MAXW, Jul 12, 2007.

  1. MAXW

    MAXW Guest

    We use PLESK on an SuSe Linux 9 plattform.

    Single CPU 3000+
    1 GB RAM
    1 Gbps

    We host different websites with several subdomains on the Server.

    One of these subdomains contains an application based on PHP5 with MySQL . The application is in use of about 25 conurrent users.
    Randomly the application becomes very slow. An action which normaly takes a second takes up to 40 seconds now. In that time the whole server lags and even the other websites are slow. But only for HTTP-Requests.

    Our we tried to analyse the problem:
    - HDD only 9% in use

    - show processes with "top":
    While a lag appeared no CPU Load for any http or MySQL processes

    - show network traffic with "iptraf"
    Nearly no traffic hits the server

    - show apache status with "apachetop"
    Normaly 2 requests per second

    Has somebody any ideas what we can check to find the problem?