Reconfiguring the Kernel in HP-UX Release 11i Version 1.5

Chapter 1 5
enabled on HP-UX Release 11i Version 1.5 for Itanium-based systems.
❏ An automatic tunable is one that is constantly being tuned by the kernel itself in
response to changing system conditions.
The list of dynamic and automatic tunables is continually growing. To determine which
tunables are dynamic on your system, use the kmtune (1M) command), or see the Kernel
Configuration
portion of SAM. In SAM’s Configurable Parameters screen, administrators can
tell at a glance whether or not the value of a particular tunable can be changed without a
reboot.
The tunable system parameters are edited using SAM or kmtune. When SAM is used to
change a tunable, the administrator is informed whether or not that change requires a
reboot. If no reboot is required, SAM makes the change to the tunable immediately.
For more information on dynamic tunables, see the Dynamically Tunable Kernel
Parameters in HP-UX 11i white paper.
• Adding certain Hewlett-Packard or third-party vendor software
If you add certain optional add-on software, such as LAN (Local Area Network) or NS
(Network Services), you might need to reconfigure the kernel. If kernel modules are
installed with the software they may be traditional static kernel modules or DLKMs.
Traditional kernel modules require whole kernel configuration and system reboot. DLKMs
may be dynamically configured into the running kernel and may not require system
reboot. Consult the manual that came with the software for installation instructions.
• Creating a file system of a type other than JFS
Depending on how your kernel is configured, you might have to reconfigure if you created a
file system of a type other than the default file system (JFS). See Managing Systems and
Workgroups: A Guide for HP-UX System Administrators
for information on file system types.
• Adding, removing, or modifying swap, dump, console devices or the root file
system
You will need to perform whole kernel configuration for adding or removing dump devices
and modifying the location ofprimary swap or the system console. For information on swap
space, see the section “Managing Swap and Dump” in Chapter 3, “Configuring a System”
in Managing Systems and Workgroups: A Guide for HP-UX System Administrators.
To add, remove, or modify the root file system, you will not be able to use SAM. Instead,
re-install your system or see “Creating Root Volume Group and Root and Root and Boot
Logical Volumes” in Chapter 3, “Configuring a System” in Managing Systems and
Workgroups: A Guide for HP-UX System Administrators, if you are using logical volumes.
NOTE If you have cold-installed an HP 9000 Model T500 and you are