Tunable Kernel Parameters
NAME [Toc] [Back]
ncdnode - maximum number of open CDFS files (system-wide)
VALUES [Toc] [Back]
Default [Toc] [Back]
Allowed values [Toc] [Back]
The minimum value allowed is 25. The maximum value allowed is memory
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
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
Tunable Kernel Parameters
What Other Tunable Values Should Be Changed at the Same Time?
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
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 [ Back ]