1) kernel cage, 2) floating boards – Fujitsu Siemens Computers SPARC Enterprise M8000 User Manual
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SPARC Enterprise Mx000 Servers Dynamic Reconfiguration User’s Guide • September 2007
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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 assginment.
■
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
Section 2.3.2, “Settings of Kernel Cage
.
(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.
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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 2-14
. Also see the SPARC Enterprise
M4000/M5000/M8000/M9000 Servers XSCF User’s Guide or the setdcl(8) man page
for further details.
(1.3) Kernel Memory Assignment
When a domain is powered on, the Power On Self Test (POST) initially assigns an
address space to each system board in that domain. The order in which address
spaces are assigned depends on the LSB number and floating board option of each
system board. The first address spaces are assigned to non-floating boards in
ascending order of LSB number. Then, additional address spaces are assigned to
floating boards, again in ascending order of their LSB numbers.