Note- Read an d understand the instructions in this chapter before starting the maintenance
work.Also see the contents of "Chapter 1 BeforeStarting MaintenanceW ork."
Table14-1 Typesof ma intenance for PSU backplane unit
Configuration Active/hot Active/cold Inactive/hot Inactive/cold(*1) System stopped
Single-chassis configuration
Unsupported Unsupported Unsupported Supported Supported
Building block configuration
Unsupported Supported (*2) Unsupported Supported Supported
*1: For a single -chassis configuration, the inactive/cold maintenance procedure is the same as that for stopping the system, there fore see
theprocedure for system-stoppe d maintenance.
*2: It is neces sary to use dynamic reconfiguration (DR) to disconnect a ch assis requiring maintenance from the physical partition.
Table14-2 Maintenanceflow
Detailsof update process Replacement
1 Preparation 14.3
2 Removing the PSU backplaneunit 14.4
3 Installing the PSU backplane unit 14.5
4 Restoring the system 14.6

14.2.1 T ypes of maintenance

Table14-1 lists the types of maintenance for the PSU backplane unit. For the
definitionof maintenance, see "4.3 Understanding Typesof Maintenance."

14.2.2 Maintenance flow

Table14-2 lists the sequence of the mai ntenance procedure for the PSU backplane
unit.
14.3 Enabl ing the Removal of the PSU
Backplane Unit
Thissection describes the preparation that must be completed prior to removing the
PSUbackplane unit. The preparation procedure differs depending on the maintenance
typea s follows:
Chapter14 Maintainingthe PSU Backplane Unit 267