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17-1
CHAPTER
17
Crossbar Unit Replacement
This chapter explains the replacement procedure for crossbar units (XBUs). It covers the
following:
■ Section 17.1, “Overview of XBUs” on page 17-1
■ Section 17.2, “Cold Replacement” on page 17-4
As a replacement method for XBUs, only the cold replacement method can be used. For the
definition of the replacement method, see Section 4.1, “Types of Replacement Procedures”
on page 4-2.
17.1 Overview of XBUs
This section provides an overview of XBUs and describes their mounting locations.
XBUs are mounted only in the M9000 server. XBUs logically switch between connections to
CPU/memory board unit (CMU) and I/O units (IOUs). Active maintenance cannot be
performed on XBUs even during degraded operation involving the XBUs.
FIGURE 17-1 and FIGURE 17-2 show the mounting locations of XBUs in the cabinets of the
M9000 server (base cabinet), and M9000 server (with the expansion cabinet), respectively.