Exp3500 Expansion Enclosure Power Features; Turning On The Expansion Enclosure - IBM DS3500 Installation, User & Maintenance Manual

cycle will be terminated and the battery will perform a new learn cycle at the next
scheduled interval (eight weeks from the current learn cycle). A learn cycle
interruption is caused by removing the battery from the controller chassis, resetting
the power to the storage subsystem, or if an expansion enclosure or battery
overheats.
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:
self-testing.

EXP3500 expansion enclosure power features

This section contains instructions for turning the expansion enclosure on and off in
normal and emergency situations.
If you are turning on the expansion enclosure after an emergency shutdown or
power outage, see "Turning on the expansion enclosure after an emergency" on
page 90.

Turning on the expansion enclosure

To turn on the power for the initial startup, complete the following steps:
1. Make sure that:
2. Check the system documentation for all the hardware devices that you want to
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System Storage DS3500 and EXP3500: Installation, User's, and Maintenance Guide
Write caching is suspended while a battery pack is either charging or
a. All cables are correctly connected.
b. Both power cords are connected into the rear of the expansion enclosure
and into properly grounded electrical outlets.
c. All hard disk drives are locked securely in place.
Important: You must install a minimum of four hard disk drives for both
power supplies to operate in a redundant mode.
turn on and to determine the correct power-on sequence.
Note: Be sure to turn on the expansion enclosure before or at the same time
as you turn on the device that contains the RAID controller.