Fujitsu SPARC Enterprise M4000 Features Manual page 28

(1) Kernel Memory Board
A kernel memory board is a system board on which kernel memory (memory
internally used by the Oracle Solaris OS and containing an OpenBoot PROM
program) is loaded. Kernel memory cannot be removed from the system. But the
location of kernel memory can be controlled, and kernel memory can be copied from
one board to another.
To control whether a system board contains kernel memory, use one or more of
■
the following features, which are described below: kernel cage, floating boards,
and kernel memory assignment.
To copy kernel memory from one board to another, use the Copy-rename
■
operation. Copy-rename makes it possible for you to perform DR operations on
kernel memory boards.
(1.1) Kernel Cage
The kernel cage function must be in use for DR operations on memory to succeed.
Without the kernel cage, kernel memory could be assigned to all system boards,
making it impossible to perform DR operations on memory. With the kernel cage,
kernel memory is limited to a minimum set of system boards.
For details on enabling this function, see
Memory" on page
(1.2) Floating Boards
A floating board is a system board that is designated to be moved easily to another
domain. In general, kernel memory is not assigned to a floating board unless
absolutely necessary.
However, kernel memory can be assigned to a floating board when one of the
following is true:
The total amount of space available among non-floating boards is not enough to
■
hold the kernel memory.
The deleteboard(8) command is used with its -f (force) option.
■
For details on enabling the floating board option for a system board, see
Section 2.2.2.2, "Floating Board Option" on page
SPARC Enterprise M3000/M4000/M5000/M8000/M9000 Servers XSCF User's Guide or
the setdcl(8) man page.
2-6 SPARC Enterprise Mx000 Servers Dynamic Reconfiguration User's Guide • January 2012
2-17.
Section 2.3.2, "Settings of Kernel Cage
2-14. For further details, also see the