Power Supplies; Figure 1-8 Power Supply Canister - Sun Microsystems Sun StorEdge A3500 Manual

The battery unit provides backup power to the cache memory in the controllers.
During a power outage, a properly charged battery unit maintains electrical power
to the controllers for up to three days. All data stored in memory is preserved as
long as the batteries can sustain power to the cache memory.
Note – For newly installed systems, the battery charges and runs self-tests for up to
12 hours. During this time, write caching is not active.
Both batteries inside the battery canister have a two-year life expectancy. Because the
battery unit is a sealed canister, you must replace the entire canister every two years.
Caution – The battery unit weighs approximately 24 pounds. Be prepared to
!
support its weight if you remove it from the chassis.
1.3.2

Power Supplies

Two DC power supplies in the controller module provide power to the internal
components, converting incoming AC voltage to DC voltage. These are redundant
power supplies—one power supply maintains electrical power to the controller
module if the other power supply fails. Both power supplies are removable canisters
that slide into one of two slots on the back of the controller module. Each canister
has a locking lever, a green power LED, a power switch, and an AC power cord
connector ( ).
FIGURE 1-8
Power switch
Locking lever
Ventilation holes
Power LED
Power connector
Power Supply Canister
FIGURE 1-8
Chapter 1 Product Overview 1-9