Jump to content United States-English
HP.com Home Products and Services Support and Drivers Solutions How to Buy
» Contact HP
More options
HP.com home
HP-UX Reference > N

ncdnode(5)

Tunable Kernel Parameters
HP-UX 11i Version 3: February 2007
» 

Technical documentation

» Feedback
Content starts here

 » Table of Contents

 » Index

NAME

ncdnode — maximum number of open CDFS files (system-wide)

VALUES

Failsafe

150

Default

150

Allowed values

The minimum value allowed is 25. The maximum value allowed is memory limited.

Specify a positive integer value.

DESCRIPTION

ncdnode defines the number of slots in the inode table for in the CD-ROM 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

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.

What Other Tunable Values Should Be Changed at the Same Time?

None.

WARNINGS

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

ncdnode was developed by HP.

Printable version
Privacy statement Using this site means you accept its terms Feedback to webmaster
© 1983-2007 Hewlett-Packard Development Company, L.P.