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7-1
CHAPTER
7
I/O Unit (IOU) Replacement
This chapter explains the replacement procedures for the I/O unit (IOU). It covers
the following:
■ Section 7.1, “Overview of the IOU” on page 7-2
■ Section 7.2, “Active Replacement and Hot Replacement” on page 7-8
■ Section 7.3, “Cold Replacement” on page 7-17
There are three methods for replacing an IOU: active replacement, hot replacement
and cold replacement. For the definition of each type of method, see Section 4.1,
“Types of Replacement Procedures” on page 4-2.
In case of the SPARC Enterprise M8000 server, when you do maintenance on the I/O
unit, the cables connected to the unit which mounted in the rack space for the
SPARC Enterprise M8000 server must be properly routed. For details, see Section 4.7,
“Cable Routing of the SPARC Enterprise M8000 Server” on page 4-34.
Note – To do maintenance on the IOU or the FAN unit of the SPARC Enterprise
M8000 server, push aside the cables.
Note – When mounting an IOU, also mount the CPU/memory board (CMU) whose
component number represents the same mounting location as the IOU.
Example: Mount IOU#1 together with CMU#1.
Note – In hot replacement of an IOU, the CMU whose component number
represents the same mounting location as the IOU must be disconnected from the
domain. Neither the DR operation for only an IOU nor hot replacement of only an
IOU are possible.