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  1. #1
    Join Date
    Feb 2005
    Posts
    48

    Question Unanswered: SCO Openserver 5 Kernel parameters

    Hi All ,

    Please i need to know :
    1- if there is any document about Kernel Parameters configuration for SCO OpenServer 5 ( recommended values, min , max ).

    2- after changing some parameters , relinking kernel , we are having some warning about exceeding the required values , will that create a problem for us later ?

    Thank you .
    Best Regards,

  2. #2
    Join Date
    Sep 2009
    Location
    Ontario
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    1,057
    Provided Answers: 1
    /etc/conf/cf.d/mtune is a text file containing the minimum default and maximum settings for each tunable parameter. The maximum is the SCO recommended maximum, and can be exceeded for some parameters.

    /etc/conf/cf.d/stune contains the settings that are different from the default that are in the current configuration.

    Increasing values generally increases the size of the kernel, though memory isn't much of an issue these days. Increasing too much though may hurt performance by making searches through cache longer than re-retrieving data from disk for example.

  3. #3
    Join Date
    Feb 2005
    Posts
    48

    Exclamation

    Hi ,

    parameters that are changed are mainly related to semaphors ..semmna ,.,.semmni ..... will that create a problem later in our server ?

    is there any Documentfor that ?

    thank you .

  4. #4
    Join Date
    Sep 2009
    Location
    Ontario
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    Provided Answers: 1
    Semaphores are used for program to program communication. How many you need will depend upon how your application software is written, and how many concurrent sessions there are.
    As a general rule, you can start by doubling the value of any parameter that shows it is being exceeded.

    Does this help: Kernel parameters that you can change using configure

  5. #5
    Join Date
    Feb 2005
    Posts
    48
    My customer is worried from the warnings he is getting after he changed the values for some semaphores parameters and relinked the kernel .
    the search is much faster now and more users can access the database , but he is afraid that his database will crash or fail due to the warnings he is getting from the kernel parameters .

    Do you think these warning could lead to something serious or it is just a notes that values are exceeded?

  6. #6
    Join Date
    Sep 2009
    Location
    Ontario
    Posts
    1,057
    Provided Answers: 1
    If the only warnings come from the re-linking process and not from day to day operations, then there should be no concern.
    You could always modify the mtune file so that the maximum value is greater than the value you have chosen, then the kernel would re-link with no warnings.

  7. #7
    Join Date
    Feb 2005
    Posts
    48
    Thank you .

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