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  man pages->HP-UX 11i man pages -> vxfs_bc_bufhwm (5)              


 vxfs_bc_bufhwm(5)                                         vxfs_bc_bufhwm(5)
                          Tunable Kernel Parameters

 NAME    [Toc]    [Back]
      vxfs_bc_bufhwm - VxFS buffer cache high water mark(determines the VxFS
      buffer cache size)

 SYNOPSIS    [Toc]    [Back]
      /usr/bin/kctune -s vxfs_bc_bufhwm={maximum size of buffer cache}

 VALUE    [Toc]    [Back]
      Specify an integer value.

    Minimum    [Toc]    [Back]
      6144 KB

    Maximum    [Toc]    [Back]

    Default    [Toc]    [Back]

 DESCRIPTION    [Toc]    [Back]
      VxFS maintains a buffer cache in the kernel for frequently accessed
      file system metadata in addition to the HP-UX kernel buffer cache that
      caches the file data.  vxfs_bc_bufhwm tunable parameter determines the
      size of the VxFS buffer cache (the maximum amount of memory that can
      be used to cache VxFS metadata).

      The default value computed based on the amount of system memory
      ensures good system performance across a wide range of applications.

      The value of vxfs_bc_bufhwm is specified in kilobytes. To improve
      performance during application loads that cause frequent file system
      metadata changes on the system (for example, a high rate of file
      creation or deletion, or accessing large directories), change the
      value of vxfs_bc_bufhwm.

    Notes    [Toc]    [Back]
      Use the vxfsstat command to monitor buffer cache statistics and inode
      cache usage.

 EXAMPLES    [Toc]    [Back]
      Set the maximum of size of buffer cache at 300000:

      # kctune -s vxfs_bc_bufhwm=300000

 WARNINGS    [Toc]    [Back]
      All HP-UX kernel tunable parameters are release specific.  This
      parameter may be removed or its meaning may change in the future
      releases of HP-UX.

      Installation of optional kernel software, from HP or other vendors,
      may cause changes to tunable parameter values.  After installation,

 Hewlett-Packard Company            - 1 -      HP-UX 11i Version 2: Sep 2004

 vxfs_bc_bufhwm(5)                                         vxfs_bc_bufhwm(5)
                          Tunable Kernel Parameters

      some tunable parameters may no longer be at the default or recommended
      values.  For information about the effects of installation on tunable
      values, consult the documentation for the kernel software being
      installed. For information about optional kernel software that was
      factory installed on your system, see HP-UX Release Notes at

 SEE ALSO    [Toc]    [Back]
      kctune(1M), vxfsstat(1M), vx_maxlink(5), vx_ninode(5),

 Hewlett-Packard Company            - 2 -      HP-UX 11i Version 2: Sep 2004
[ Back ]
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