Managing Systems and Workgroups: A Guide for HP-UX System Administrators
Configuring a System
Reconfiguring the Kernel (Prior to HP-UX 11i Version 2)
Chapter 3 283
❏ A dynamic tunable is one whose value can be changed without a
reboot.
❏ 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 HP-UX 11i
system, use the kmtune command (see the kmtune (1M) manpage), 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 the kmtune
command. Any time a tunable is changed using SAM, it will inform
the administrator whether or not that tunable change requires a
reboot. If no reboot is required, SAM will then proceed to make the
tunable change immediately.
For more information on dynamic tunables, see the Dynamically
Tunable Kernel Parameters in HP-UX 11i white paper at the
following web site:
http://docs.hp.com
• Adding certain Hewlett-Packard software
If you add certain Hewlett-Packard software, such as LAN (Local
Area Network) or NS (Network Services), you might need to
reconfigure the kernel. 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 “Planning to Manage File Systems” on
page 83 for information on file system types.
• Adding, removing, or modifying swap, dump, console devices
or the root file system
You will need to reconfigure the kernel for adding and removing
dump devices and modifying the location of primary swap or the
system console. For information on swap space, see “Managing Swap
and Dump” on page 662.