expanded_node_host_names.5 (2010 09)

e
expanded_node_host_names(5) expanded_node_host_names(5)
(Tunable Kernel Parameters)
NAME
expanded_node_host_names - enable maximum length expansion of the system node and host names
VALUES
Failsafe
0 -off
Default
0 -off
Allowed Values
0 -off
1 -on
DESCRIPTION
The
expanded_node_host_names
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 max-
imum 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, respectively.
What Other Tunable Values Should Be Changed at the Same Time?
None.
APPLICATION USAGE
For more information on usage see the whitepaper Node and Host Name Sizes on HP-UX: Using the
Expanded Capabilities .
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 nodehostnamesize(5)).
Warnings are always issued from the tunable handler when this tunable is changed.
HP-UX 11i Version 3: September 2010 − 1 − Hewlett-Packard Company 1