Data caching starts after the battery is charged to the programmed voltage level, which occurs when the
storage subsystem power is first turned on, when a new battery is installed to replace a failed battery, or
when the subsystem power is turned on after months of inactivity.
Attention: Write caching is suspended while a battery pack is either charging or self-testing.
Turning off the storage subsystem
The DCS3700 is designed to run continuously. After you turn it on, do not turn it off. Turn off the power
only in the following situations:
v Instructions in a hardware or software procedure require that you turn off the power.
v An IBM technical-support representative instructs you to turn off the power.
v A power outage or emergency situation occurs, see “Restoring power after an unexpected shutdown”
on page 85 .
Attention:: Except in an emergency, never turn off the power if any amber (needs attention) LEDs are lit.
Correct the fault before you turn off the power. Use the Storage Manager software and the
amber LEDs to check the overall status of the DCS3700 . All LEDs should be green on the
front of the storage subsystem. If they are not, use the Storage Manager software to diagnose
the problem so that the DCS3700 will power-on correctly later.
(L003)
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Chapter 4. Operating the DCS3700 storage system and expansion enclosure 83
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