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C-6 SPARC Enterprise M4000/M5000 Servers Service Manual • August 2009
C.3 Backplane Unit
The midrange servers contain an I/O backplane/power backplane unit, which is a
circuit board containing a set of sockets to which other circuit boards can be
connected.
Refer to “Backplane Unit Replacement” on page 14-1 for replacement procedures.
C.4 I/O Unit
The I/O in the midrange servers is handled by four separate Peripheral Component
Interconnect (PCI) buses. These industry-standard buses support all of the servers
on-board I/O controllers in addition to the interface cards in the system.
The I/O unit (IOU) is identical in both midrange servers. The IOU monitors I/O
events and has the following features:
■ PCI cards (see TABLE C-4)
■ Inter-integrated circuit (I2C) components for environmental monitoring
■ PCI-Express switches or bridges connected to the slots
There is one IOU in the SPARC Enterprise M4000 server and two IOUs in the SPARC
Enterprise M5000 server. Each IOU has one I/O controller. There are four PCI buses
in each server. To remove or install the IOU, you must halt the Solaris OS and power
off the server (cold replacement).
The IOU houses the following:
■ Four PCIe short card slots (four upper slots)
■ One PCI-X short card slot (lowest slot)
The IOU holds cassettes that support two types of PCI cards (
TABLE C-4):
■ PCIe
■ PCI-X