Settings Of Kernel Cage Memory - Fujitsu SPARC Enterprise M4000 Features Manual

Even if the DDI_DETACH interface is supported, DDI_DETACH processing fails
when the relevant driver is in use. Before starting the deletion of a system board,
you must stop using all devices on the system board to be deleted.
The device drivers that do not support DR must be unloaded before a system board
is deleted. To unload a device driver, you must stop using all I/O devices controlled
by the device driver. To unload a device driver, you can use the Oracle Solaris
command modunload(1M). Then, you can reload the driver for the remaining
instances and resume using those remaining instances after deleting the system
board.
2.3.2

Settings of Kernel Cage Memory

Kernel cage memory is a function used to minimize the number of system boards to
which kernel memory is allocated. Kernel cage memory is enabled by default in the
Oracle Solaris 10 OS.
If the kernel cage is disabled, the system may run more efficiently, but kernel
memory will be spread among all boards and DR operations will not work on
memory.
To determine whether kernel cage memory is enabled after the system has been
rebooted, check the following message output from the /var/adm/messages file:
NOTICE: DR kernel Cage is ENABLED
If the kernel cage is disabled, the message will be:
NOTICE: DR kernel Cage is DISABLED
In most cases the kernel cage should be enabled. However, you must consider actual
operations before changing the setting. If you do not need to perform DR operations,
you do not need to enable the kernel cage.
To enable kernel cage memory, remove or comment out the following setting from
the /etc/system file:
set kernel_cage_enable=0
The OS must be rebooted to make the new setting effective.
Chapter 2 What You Must Know Before Using DR 2-17