Chapter 4: Turning storage system power on
and off
The storage system can be powered on and o using the power control panel located on
the node interconnect switch during normal operating conditions or a power failure. See
Node interconnect switch (on page 41) for switch locations.
System idle mode
When the storage system power cables are plugged into the PDUs and the PDU breakers
are on, the storage system is in idle (basic supply only) mode. When the storage system
is in idle mode:
■
The amber Basic Supply (BS) LED on the control panel is on. AC power is applied to
the power supplies.
■
The green READY LED is o. The controller chassis and drive boxes are not
operational.
■
The fans in both the controller chassis and drive boxes are running.
■
The cache backup batteries are being charged.
■
The storage system consumes signicantly less power than it does in operating mode.
For example, a storage system that draws 100 amps while operating draws only 40 to
60 amps in idle mode, depending on the number of drives in the system. The more
drives, the more power is saved. See
Table 4 Maximum idle power per component (on
page 69) and Mechanical environmental specications (on page 67) .
To put the storage system into idle mode from the OFF condition:
1. Ensure power is available to the AC input boxes and PDUs in all racks.
2. Turn on all PDU power switches and circuit breakers.
To put the storage system into idle mode from a power on condition, perform the steps
in Power o procedures (on page 70) .
To shut down the storage system, perform the power o procedures, and then turn o
all PDU circuit breakers.
Warning: Verify the storage system is turned o normally and in idle mode
before turning o the PDU circuit breakers. Otherwise, turning o the PDU
circuit breakers can leave the storage system in an abnormal condition.
Chapter 4: Turning storage system power on and o
Hitachi Virtual Storage Platform 5000 Series Hardware Guide 68
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