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