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Recovering From A Power Outage - Hitachi AMS 2100 Hardware Manual

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To completely power down an expansion unit:
1. Turn off the Main / Power switch and verify that the green Ready LED on
the front panel of the base unit to which the expansion unit is attached
is OFF.
2. Turn off the power switches or circuit breakers in the PDBs to which the
expansion unit is connected.
3. Unplug the power cables from both power supplies in the expansion
unit.
CAUTION! Residual power may remain in the power supplies for
up to a minute after the power supplies are turned off.

Recovering from a power outage

If your site experiences a power outage, the backup batteries preserve the
contents in cache that have not yet been written to disk. Protection times
vary, depending on the size of the cache.
NOTE: The backup batteries do not provide power to the array or act as
an uninterupable power supply.
To restore power to the array after a power outage:
NOTE: If possible, complete the following procedure before the power to
the site is restored.
1. Stop all host I/O to the array, if possible.
2. On the base unit front panel, set the Main Switch to standby.
3. Remove the two power cables from the power receptacles on the array
rear panel. To prevent possible damage from a power surge when the
power comes back on, leave them disconnected until after the power is
restored.
Alternate method: Turn the circuit breakers on the rack PDU off.
4. When power returns, reconnect the power cables to the power
receptacles on the array rear panel and then set the Main switch to the
ON position. The green Power LED on the front panel should light at this
time, and the array performs its POST, which takes about 4 minutes. At
that time the green Ready LED on the front panel lights and the unit is
ready for use.
NOTE:
the Ready LED, see
5. If host I/O activity was stopped, resume I/O activity to the array.
6–6
If the Alarm or Warning LED on the front panel lights instead of
Troubleshooting based on LED indications on page 8-13
Power On/Off procedures
Hitachi AMS 2100/2300 Storage System Hardware Guide
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