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48 SPARC Enterprise Mx000 Servers Administration Guide • April 2007
FIGURE 4-3 A Physical System Board in Quad-XSB Mode on a Midrange Server
FIGURE 4-4 A Physical System Board in Quad-XSB Mode on a High-End Server
A domain consists of one or more XSBs. Each domain runs its own copy of the
Solaris OS. A domain must have, at a minimum, 1 CPU, 8 DIMMs, and I/O.
In
FIGURE 4-3, one domain (for example, domain 0) must contain XSB 00-0, and the
second domain (for example, domain 1) must contain XSB 00-1, because of the I/O
requirement for a domain. The remaining XSB 00-2 and XSB 00-3 can be assigned to
either domain, or to none.
Quad-XSB mode
(1 physical system board divided into
2 domains, each with 1 CPU, 8 DIMMs, and I/O)
CPU
I/O device
I/O device
Memory - 8 DIMMs
Memory - 8 DIMMs
Memory - 8 DIMMs
Memory - 8 DIMMs
CPU
CPU
CPU
XSB00-0
XSB00-1
XSB00-2
XSB00-3
CMU IOU
Quad-XSB mode
(1 physical system board divided into
4 domains, each with 1 CPU, 8 DIMMs, and I/O)
CPU
I/O device
I/O device
I/O device
I/O device
Memory - 8 DIMMs
Memory - 8 DIMMs
Memory - 8 DIMMs
Memory - 8 DIMMs
CPU
CPU
CPU
XSB00-0
XSB00-1
XSB00-2
XSB00-3
CMU IOU