52 SPARC Enterprise Mx000 Servers Administration Guide • August 2009
FIGURE 4-3 A Physical System Board in Uni-XSB Mode on a High-End Server
■ Quad-XSB (midrange and high-end servers only)
■ A PSB logically divided and configured into four XSBs
■ Each of the four XSBs contains one-quarter of the total board resources: 1 CPU,
8 DIMMs, and I/O. On a midrange server, only two XSBs have I/O.
Note – Although a CMU with two CPUs can be configured into Quad-XSB mode on
a high-end server, the server generates a "configuration error" message for those
XSBs that do not have a CPU and memory.
FIGURE 4-4 shows a PSB in Quad-XSB mode on a midrange server, and FIGURE 4-5
shows a PSB in Quad-XSB mode on a high-end server.
The logical dividing between Uni-XSB and Quad-XSB is done using the setupfru
command.
CPU
Uni-XSB mode
(1 physical system board with
4 CPUs, 32 DIMMs, and I/O)
I/O device
I/O device
I/O device
I/O device
CPU
CPU
CPU
Memory - 8 DIMMs
Memory - 8 DIMMs
Memory - 8 DIMMs
Memory - 8 DIMMs
CMU IOU
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