Fujitsu SPARC ENTERPRISE M4000 Service Manual page 277

System Features (Continued)
TABLE B-1
Features
I/O unit (IOU)
PCI cassettes
PCI cards
eXtended System Control
facility unit
SPARC Enterprise SPARC Enterprise
M4000 Server M5000 Server
1 2
5 cassettes per • 5 cassettes per
tray in the IOU tray in the
IOU
• 2 IOUs (10
cassettes)
5 (1 PCI-X and 4 10 (2 PCI-X and
PCIe) 8 PCIe)
1 1
Notes
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.
The service processor, which operates
independently from the SPARC64™ VI or
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.
Appendix B Rules for System Configuration B-3