hpux man page for expanded_node_host_names

expanded_node_host_names(5)					File Formats Manual				       expanded_node_host_names(5)

NAME
       expanded_node_host_names - enable maximum length expansion of the system node and host names

VALUES
   Failsafe
   Default
   Allowed Values
DESCRIPTION
       The tunable controls the length of the system node and host names.  When this tunable value is 0, the system utilities used to set node and
       host names allow compatible name lengths.  That is, 8 and 64 bytes for node and host name, respectively.  When this tunable value is 1, the
       utilities allow expanded lengths up to 255 bytes.

       Changing this tunable does not affect the current system node and host names.

       Node  and host names larger than 8 and 64 bytes, respectively, can cause anomalous or incorrect behavior in applications using these names.
       See the WARNINGS section for more information.

   Who Is Expected to Change This Tunable?
       The system administrator may change this tunable when it is necessary to change the maximum allowed length of the system node  and/or  host
       names.

   Restrictions on Changing
       This  tunable  is  dynamic.  Changing its value to 1 immediately allows the administrator to assign expanded (up to 255 bytes) node or host
       names.  Changing its value to 0 enforces the compatible maximum of 8 and 64 byte node and host names on any  subsequent	name  setting  but
       does not affect the current name settings.

   When Should the Value of This Tunable Be Raised?
       This tunable may be raised to 1 when it is necessary to assign an expanded node and/or host name.

   What are the Side Effects of Raising the Value?
       Raising the tunable value to 1 causes the system utilities used to set node and host names to allow names up to 255 bytes.

   When Should the Value of This Tunable Be Lowered?
       This tunable should be lowered to 0 when it is determined that expanded node and host names are not necessary.

   What are the Side Effects of Lowering the Value?
       Lowering  the  tunable  value to 0 causes the system utilities used to set node and host names to allow names up to 8 and 64 bytes, respec-
       tively.

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

APPLICATION USAGE
       For more information on usage see the whitepaper

WARNINGS
       Node and host names in excess of 8 and 64 bytes, respectively, can cause anomalous behavior or failure in applications using  these  names.
       The  administrator  should  read  and understand the issues as described in the related documentation (see the whitepaper and nodehostname-
       size(5)).

       Warnings are always issued from the tunable handler when this tunable is changed.

       When this tunable value is 0 (off), the system interfaces and commands which set node and host names quietly truncate inputs  to  8  or	64
       bytes, respectively.  This behavior is consistent with previous versions.  There is no error nor warning provided.

       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  tun-
       able  values,  consult  the documentation for the kernel software being installed.  For information about optional kernel software that was
       factory installed on your system, see at

       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.

AUTHOR
       was developed by HP.

SEE ALSO
       hostname(1), uname(1), setuname(1M), gethostname(2), sethostname(2), uname(2), hostname(5), nodehostnamesize(5).

       whitepaper, available on

							     Tunable Kernel Parameters				       expanded_node_host_names(5)