ncdnode(5)                                                       ncdnode(5)
                          Tunable Kernel Parameters



 NAME    [Toc]    [Back]
      ncdnode - maximum number of open CDFS files (system-wide)

 VALUES    [Toc]    [Back]
    Failsafe
      150

    Default    [Toc]    [Back]
      150

    Allowed values    [Toc]    [Back]
      The minimum value allowed is 25.  The maximum value allowed is memory
      limited.

      Specify a positive integer value.

 DESCRIPTION    [Toc]    [Back]
      ncdnode defines the number of slots in the inode table for in the CDROM
 file systems (CDFS).  This number limits the number of open nodes
      that can be in memory for CDFS file systems at any given time.  It is
      functionally similar to ninode but applies only to CD-ROM file
      systems.

    Who Is Expected to Change This Tunable?
      This tunable may need to be modified on systems that run applications
      requiring access to CD-ROM file systems.

    Restrictions on Changing    [Toc]    [Back]
      The cdfs kernel module, which provides the file system type specific
      support for CD-ROM file systems, is now a dynamically loadable kernel
      module (DLKM).  Any changes to the value of the tunable ncdnode will
      take effect after the cdfs kernel module is unloaded and re-loaded
      (see kcmodule(1M)), or after system reboot.

    When Should the Value of This Tunable Be Raised?
      The value may need to be raised when running applications which
      require large numbers of simultaneously open CDFS files.

    What are the Side Effects of Raising the Value?
      More system memory will be consumed for the CDFS nodes.  A larger
      static inode table for CDFS will be created based on the value of
      ncdnode upon cdfs kernel module load or system reboot

    When Should the Value of This Tunable Be Lowered?
      The value can be lowered to limit the number of CDFS open files on the
      system and reduce memory consumption.

    What are the Side Effects of Lowering the Value?
      Less system memory will be consumed for the CDFS inodes upon cdfs
      kernel module load or system reboot.




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






 ncdnode(5)                                                       ncdnode(5)
                          Tunable Kernel Parameters



    What Other Tunable Values Should Be Changed at the Same Time?
      None.

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

      Installation of optional kernel software, from HP or other vendors,
      may cause changes to tunable parameter values.  After installation,
      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
      http://docs.hp.com.

 AUTHOR    [Toc]    [Back]
      ncdnode was developed by HP.

 SEE ALSO    [Toc]    [Back]
      kctune(1M), kcmodule(1M), sam(1M), gettune(2), settune(2), ninode(5).


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