Hitachi CBL, Hardware Service Manual

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Procedures before and after replacing components
Hitachi Unified Storage Hardware Service Guide
• Do not block or cover the openings of the storage system hardware.
Never place a unit near a radiator or heat register. Failure to follow
these guidelines can cause overheating and affect the unit’s reliability.
• After a component has been replaced, secure the chassis cover to the
storage system. The chassis is designed to let cooling air flow
effectively within it. An open chassis allows air leaks that might
interrupt and redirect the flow of cooling air from internal components.
• Do not make mechanical or electrical modifications or repairs to the
equipment. Such actions can cause an electric shock or cause the
storage system to malfunction. Hitachi is not responsible for regulatory
compliance of a modified Hitachi product.
• When removing cables, hold the cable connector and leave enough
slack in the cables, so they do not bend to a diameter of less than 76
mm (3") or a radius less than 38 mm (1.5") when extended and do not
become pinched when retracted.
• A DBW can reach 80 dB at a temperature of 32°C, with a maximum
decibel level of 85dB. When a DBW is connected to a CBL, refrain from
working on the DBW for a prolonged period of time.
Guidelines to follow when replacing a component
Observe the following guidelines when replacing a component in Hitachi
Unified Storage systems.
• Replace components after the green READY LED on the controller front
panel goes ON.
• Use only the replacement parts specified in this guide.
• Do not perform maintenance when the green READY LED on the
controller front panel blinks quickly because the ENC firmware is being
downloaded. Wait for the READY LED on the Controller Box to go ON
before performing maintenance (wait time can be up to 50 minutes, 60
minutes for the CBL, or 180 minutes if the DBW is connected to the
CBL).
• If you turn on a single controller and the orange WARNING LED on the
controller front panel blinks quickly, do not perform maintenance. Wait
for the WARNING LED to go OFF and the green READY LED to go ON
(30-to-85 minutes) before performing maintenance.
• If an allowable time limit for replacing a component is specified in the
replacement instructions, observe the time limit.
• When replacing a drive, controller, Host I/O Board, Host I/O Module,
cache backup battery, Drive I/O Module, I/O Module (ENC), Fan
module, or Power Unit with the storage system powered on, wait at
least 30 seconds before replacing the failed component.
If the storage system is turned on, complete the replacement within 10
minutes. Otherwise, a power-off (system-down) condition can occur.
If a Power Unit and another module fail at the same time, replace the
Power Unit first and then replace the module. Otherwise, a power-off
(system-down) condition can occur.