interruption is caused by removing the battery from the controller chassis, resetting
the power to the storage subsystem, or if a storage 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.
Chapter 4. Operating the storage subsystem and storage enclosure 103