Standby power supplies (SPSs)
A 1U, 1000-watt SPS provides backup power for power supply A. An
optional second SPS supports power supply B. During a power failure,
the SPSs allow write caching to continue, which prevents data loss. A
faulted or not fully charged SPS disables the write cache. Each SPS rear
panel has one AC inlet power connector with power switch, AC outlets
for the DPE-AX SPs, and one connector for serial connection to an SP.
Figure 8 shows the SPS connectors and status lights.
CL3881
AC power
connector
Power
switch
SP
interface
DPE-AX
Active
(green)
Replace
batte ry
(amber)
On batte ry
(amber)
Fault
(amber)
Figure 8
1000–watt SPS connectors, power switch, and status lights
You can replace an SPS while the storage system is powered up.
10
Hardware and Operational Overview