Full redundancy mode
This mode supports both grid redundancy or N+1 redundancy. 50% of the power supply output is
allocated to the reserve pool and the other 50% of the power supply outputs are allocated to the available
power pool. The reserved power may be used to backup either single power supply failures or a grid
failure.
For example, a system with six 3 kW power supplies in grid redundancy mode has a total of 18 kW. 9
kW are allocated to the available power pool and 9 kW are allocated to the reserve pool. If a grid failure
occurs (half of the power supplies loose power) the full reserve power pool is available to meet the 9 kW
commitment. Otherwise, as single power supplies fail power is allocated to the available pool from the
remaining reserve power pool until the reserve power pool is exhausted.
Note: Once a single power supply has failed in this mode, grid redundancy is no longer available.
Figure 19 on page 42 shows how to connect power supplies in a SAN768C-6 for grid redundancy
Figure 19. SAN768C-6 Grid-PSU Connections
Figure 20 on page 42 shows how to connect power supplies in a SAN384C-6 for grid redundancy
Figure 20. SAN384C-6 Grid-PSU Connections
Figure 21 on page 42 shows how to connect power supplies in a SAN192C-6 for grid redundancy
Figure 21. SAN192C-6 Grid-PSU Connections
42IBM Storage Networking SAN192C-6, SAN384C-6 and SAN768C-6: SAN192C-6, SAN384C-6 and
SAN768C-6 Installation, Service, and User Guide
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