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: Write caching is suspended while a battery pack is either charging or
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:
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.
2. Check the system documentation for all the hardware devices that you want to
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.
88 System Storage DS3500 and EXP3500: Installation, User’s, and Maintenance Guide
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