4. To stop the power supply, remove the power cables from the power supply units on
the controller chassis and drive box.
If the storage system is connected to a PDU, you can stop the power supply by
turning off the PDU breaker.
Note: If the storage system does not receive power for more than six
months, the battery can become discharged and possibly damaged. To
avoid this situation, charge the battery for more than three hours at
least once every six months.
Battery unit
Battery lifetime
The battery life time is affected by the battery temperature. The battery temperature
changes depending on the intake temperature and height of the storage system, the
configuration, operation of the controller boards and drives, charge-discharge count and
others. The battery lifetime will be three to five years.
Treatment
Use the storage system in a place where the ambient temperature is 86°F (30°C) or less
on average.
Periodic parts replacement is required. If you have a maintenance service contract, parts
are replaced periodically according to the terms of the contract.
Note: The battery protects the data in the cache memory in an emergency,
such as a sudden power failure. In these cases, follow the normal power
down procedure. If not, the battery might reach its lifespan earlier than
expected and become unusable within three years. When replacing the
battery, follow the given procedure for disposing a used battery.
Replacement period
The battery lifetime (intake temperature is 30 degrees C or less.) in the standard
environment is as shown below.
Storage System Intake Temperature
CBL
Up to 24 degrees Celsius
5 years
Up to 30 degrees Celsius
5 years
Up to 34 degrees Celsius
4 years
Up to 40 degrees Celsius
3 years
Battery unit
Chapter 6: Maintaining the storage system
Hitachi Virtual Storage Platform G900 Hardware Reference Guide
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