HP-UX Reference (11i v2 07/12) - 5 Miscellaneous (vol 9)

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core_large_utsname_on(5) core_large_utsname_on(5)
(Tunable Kernel Parameters)
NAME
core_large_utsname_on - determines the addition of a new section, CORE_UTSNAME or
PT_HP_CORE_UTSNAME, in a process core dump
VALUES
Failsafe
0 (off)
Default
0 (off)
Allowed values
1 (on) or 0 (off)
DESCRIPTION
The core_large_utsname_on
tunable determines the addition of a new section in a process core
dump. This section is called CORE_UTSNAME for SOM core files and PT_HP_CORE_UTSNAME for ELF
core files. This new section contains the expanded
utsname structure, defined in <sys/utsname.h>
.
This tunable is available to customers who install the large uname feature and do not want the new core
file section in the process core files.
Upon core dump, if this tunable is set to
1 (on), then a new core file section is created. If this tunable is set
to 0 (off), then no new core file section is created.
Who is Expected to Change This Tunable?
Only those who want the process core file to contain the new section containing the expanded
utsname
structure.
Restrictions on Changing
All core file readers should be capable of reading the new core file section which contains the expanded
utsname structure.
Changes to this tunable take effect immediately.
When Should the Value of This Tunable Be Raised?
When you have installed the large uname feature and want the new core file section that contains the
expanded utsname structure.
What Are the Side Effects of Raising the Value?
Core file readers like gdb, adb, and other third party debuggers might not work and/or might not recognize
the new core file section. Check the release notes for the large uname feature for possible solutions.
When Should the Value of This Tunable Be Lowered?
If debuggers or other tools fail due to the presence of the new core file section.
What Are the Side Effects of Lowering the Value?
Process core files no longer have the new core file section which contains the expanded utsname struc-
ture. Also, debuggers get only the first 8 characters of the system nodename from the core files.
What Other Tunable Values Should Be Changed at the Same Time?
No other tunable needs to be on.
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 parame-
ter 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.
HP-UX 11i Version 2: December 2007 Update − 1 − Hewlett-Packard Company 89