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    Ex Libris Knowledge Center

    Aleph www_server or pc_server Not Responding During Peak Hours

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    • Article Type: General
    • Product: Aleph
    • Product Version: 22

    Problem Symptoms:
    - pc_server or www_server stop responding to requests
    - No error message is displayed
    - Only after restarting the process, it starts working again
    - Max descriptors is set to a low number (under 1024). It can be checked using the command:
    ulimit -a | gr

    Cause:
    If the max descriptors value is too low, Aleph cannot open enough connections to serve all users and it therefore stops responding when it reaches the limit.

    Resolution:
    Increase the max descriptors to 4096 from user root, using the command:
    projadd group.exlibris
    (Response) projmod -sK "process.max-file-descriptor=(priv,4096,deny)" group.exlibris

    Additional Information

    For Aleph to work and serve users, it opens connections in the OS. When there are many users, it opens many connections. If there is a limit to the number of connection then the Aleph processes will not be able to open (in Sun they are called files or descriptors)

    • Article last edited: 2/25/2014