Modifying and displaying the volpagemod_max_memsz parameter of vxtune

Description

Modifying and displaying the volpagemod_max_memsz parameter of vxtune

You can modify the maximum memory measured in kilobytes that is allocated for cache object metadata. The default value for volpagemod_max_memsz is set to 6144 KB. The value that should be used is determined by the total size of volumes for which instant rollbacks are taken.

To modify the volpagemod_max_memsz parameter of vxtune

  • To modify the volpagemod_max_memsz parameter of vxtune, enter the following:

    System> option modify vxtune volpagemod_max_memsz value

    The following formula can be used to calculate the required value of volpagemod_ max_memsz:

    size_in_KB=6 * (total_filesystem_size_in_GB) * (64/region_size_in_KB)

    region_size can be set to 256 KB by default for large file systems.

    For example, to modify the volpagemod_max_memsz parameter of vxtune, enter the following:

    System> option modify vxtune volpagemod_max_memsz 12288

To display the value of the vxtune parameters

  • To display the value of the vxtune parameters, enter the following:

    System> option show vxtune

    For example, to display the value of the vxtune parameters, enter the following:

    System> option show vxtune
    NODENAME    TUNABLE                VALUE(KB)
    --------    -------                ---------
    sfs_01      volpagemod_max_memsz   12288
    sfs_02      volpagemod_max_memsz   12288

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