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Note -
Read and understand the instructions in this chapter before starting the maintenance
work. Also see the contents of "Chapter 1 Before Starting Maintenance Work."
Table 29-1
Types of PDU maintenance
Configuration Active/hot Active/cold Inactive/hot Inactive/cold System stopped
Build in g block confi g u rat io n
Unsupported Supported Unsupported Unsupported Supported
Table 29-2
Maintenance flow
Task Replacement
1 Preparation 29.3
2 Removing the PDU 29.4
3 Installing the PDU 29.5
4 Restoring the system 29.6
29.2 Before Maintaining the Dedicated
Power Distribution Unit
This section describes the types and flow of maintenance of the PDU, as well as some
precautions.
29.2.1 Types of maintenance
Table 29-1 lists the types of maintenance for the PDU. For the definition of
maintenance, see "4.3 Understanding Types of Maintenance."
29.2.2 Maintenance flow
Table 29-2 lists the sequence of the maintenance procedure for the PDU.
29.2.3 Precautions for replacement
Note the following points when you replace a PDU.
■
The SPARC M10-4S and the crossbar box are connected to the two PDUs with
power cords. Thus the system can continue to operate even if one of the PDUs
fails. Do not, however, operate the system for an extended period when one unit
Chapter 29 Maintaining the Dedicated Power Distribution Unit Mounted on the Rack for Expanded Connection 455