Appendix B Rules for System Configuration B-3
I/O unit (IOU) 1 2 Each IOU contains the following:
• PCI cards—Four short PCI Express (PCIe)
slots (four upper slots) and one short PCI-
X slot (lowest slot).
• One I/O controller (IOC) chip, which is
the bridge chip between the system bus
and the IO bus.
• Inter-integrated circuit (I2C) components
for environmental monitoring.
• PCIe switches or bridges connected to the
slots.
You can also add an optional IOBOX, which
contains additional PCIe slots or PCI-X slots.
An IOU requires a CPUM and MEMB on the
same XSB in order to be used. In the case of
quad-XSB, the slots on an IOU are divided up
among the first two parts of a quad-XSB. The
assignments cannot be changed. A separate
CPUM and MEMB are required on each part
of the quad-XSB in order to access the slots of
the IOU assigned to the parts of the quad-
XSB.
PCI cassettes 5 cassettes per
tray in the IOU
• 5 cassettes per
tray in the
IOU
• 2 IOUs (10
cassettes)
PCI cards 5 (1 PCI-X and 4
PCIe)
10 (2 PCI-X and
8 PCIe)
eXtended System Control
facility unit
1 1 The service processor, which operates
independently from the SPARC64
VI/SPARC64 VII/SPARC64 VII+ processor,
is a small system that directs the system
startup, reconfiguration, and fault diagnosis.
This is where the system management
software (XSCF) runs.
TABLE B-1 System Features (Continued)
Features M4000 Server M5000 Server Notes
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