Fujitsu Siemens Computers SX series User Manual page 386

Hardware features of the SX Series Business Servers
The basis for the division into physical partitions (PPARs) on SX130 servers is provided by
the physical system boards (PSBs) and, as of the SX140 servers, the PSB mode of an
SX server's system boards.
A physical partition can contain one or more physical system boards. A system board
carries various hardware components such as CPUs, memories and PCI slots. The
physical system boards are separated from each other in terms of hardware so that
hardware problems on one system board cannot affect other system boards.
SX130 servers only offer physical system boards.
As of the SX140 servers "extended system boards" (XSBs) can also be configured on the
system boards. Here also there are CPUs, memories and PCI slots on each extended
system board. The division of these resources over the extended system boards depends
on the model series concerned and is done according to a fixed schema which is not
variable.
As of the SX140 servers every system board contained there can be operated either in PSB
or XSB mode:
Operating a system board in PSB mode means that this system board is used as a
physical system board.
Operating a system board in XSB mode means that one or more extended system
boards can be used on this system board.
The XSB mode of the system boards forms the basis for the division into extended (logical)
partitions (XPARs). An extended partition may contain one or more extended system
boards. it is not possible to mix PSBs and XSBs in one partition.
The number of possible system boards (PSBs and XSBs) depends on the particular model
and its version, as do the maximum number of processors and the size of the memory. You
will find this information in this appendix in the section on the relevant model.
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Appendix
U41272-J-Z385-3-76