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

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fs_symlinks — maximum number of symbolic links used to resolve a path name






Allowed values

The minimum value allowed is 20. The maximum value allowed is 1024, or 1K.

Specify a positive integer value.


The fs_symlinks tunable represents the maximum number of symbolic links followed by the kernel when resolving a path name. Applications that create symbolic links and/or parse path names should also now use this limit represented by fs_symlinks to be consistent with the kernel.

Who Is Expected to Change This Tunable?

Anyone expecting to run applications using path names that may expand to a large number of symbolic links.

Restrictions on Changing

None. The fs_symlinks tunable is dynamic (tuning will take effect immediately on the running system).

When Should the Value of This Tunable Be Raised?

This tunable value should be raised when applications are expected to create and/or parse path names that may expand to a large number of symbolic links.

What are the Side Effects of Raising the Value?


When Should the Value of This Tunable Be Lowered?

This value rarely needs to be lowered, unless there is a reason to limit the number of symbolic links in an expanded path name.

What are the Side Effects of Lowering the Value?

The kernel will not be able to resolve path names with more symbolic links than the limit represented by fs_symlinks.

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



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.

NOTE: The define MAXSYMLINKS, traditionally defined in <sys/param.h>, is now obsolete and should not be used. This limit (number of symbolics links that may be expanded in a path name) is now available to applications via this new tunable parameter, fs_symlinks. The interfaces provided by the tunable infrastructure should be used to obtain the value of fs_symlinks. At the application level, use the gettune(2) or kctune(1M) interface. Applications using the MAXSYMLINKS define may not be consistent with the kernel. The MAXSYMLINKS define will be removed in post-HP-UX 11i Version 2 releases.

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.


fs_symlinks was developed by HP.

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