Load Sharing Power Supplies - IBM Nways 8260 Manual

In fault-tolerant mode the 8260 does not reserve any specific power supply in
reserve; instead, the reserved power is reserved across all the installed power
supplies as shown in Figure 49. This ensures that the failure of any one power
supply has no impact on the operation of the hub and the installed modules.
Figure 49. Load Sharing Power Supplies
If a power supply should fail, the power mode will be changed to
non-fault-tolerant and the system will supply the reserved power to the installed
modules, so that network operations can continue without interruption. Upon the
recovery of the failed power supply (for example, by replacing the failed power
supply when the 8260 is operating from the other installed power supplies) the
8260 power mode will be changed automatically back to the fault-tolerant mode.
You can set your hub to operate in fault-tolerant mode using the following DMM
command:
SET POWER MODE fault_tolerant
80
8260 Multiprotocol Intelligent Switching Hub
Table 14 (Page 2 of 2). Power Available to Modules in Fault Tolerant Mode
Output One Power
Voltage Supply
-12.0 V
Totals
Two Power
Supplies
N/A 18.00 W
N/A 293.40 W
Three Power Four Power
Supplies Supplies
30.50 W 46.00 W
520.30 W 779.15 W