IBM System Storage Subsystem DS5020 - Manual (Page 46)

controller will start a battery learning cycle to determine whether the battery current
capacity is sufficient. Data caching starts after the battery is charged to the
programmed level. During the battery learn cycle, cache will be active if the battery
is in good condition. If the battery fails the learn cycle, it is marked as failed. The
battery learning cycle lasts up to three hours. After the first battery learn cycle, the
controller will perform a learn cycle every 8 weeks to re-calibrate the
battery-charging level.
The battery unit is hot-swappable. You can remove the battery unit for servicing and
then reinsert it while the DS5020 continues to perform I/O operations. However,
write I/O caching is disabled when the battery is in a failed state or removed from
the controller chassis. Replace the failed battery as soon as possible to minimize
the time that the write IO caching is disabled.
Information about the condition of the battery unit is conveyed by indicator LEDs on
the front of battery unit. (“Battery unit LEDs” on page 103 identifies the indicator
LEDs on the battery unit and explains the conditions that each LED indicates.)
SFP modules
Statement 3:
CAUTION:
When laser products (such as CD-ROMs, DVD drives, fiber-optic devices, or
transmitters) are installed, note the following:
v Do not remove the covers. Removing the covers of the laser product could
result in exposure to hazardous laser radiation. There are no serviceable
parts inside the device.
v Use of controls or adjustments or performance of procedures other than
those specified herein might result in hazardous radiation exposure.
DANGER
Some laser products contain an embedded Class 3A or Class 3B laser
diode. Note the following.
Laser radiation when open. Do not stare into the beam, do not view directly
with optical instruments, and avoid direct exposure to the beam.
Class 1 Laser statement
Class 1 Laser Product
Laser Klasse 1
Laser Klass 1
Luokan 1 Laserlaite
Apparell
Laser de Calsse 1 À
IEC 825-11993 CENELEC EN 60 825
16 IBM System Storage DS5020 Storage Subsystem: Installation, User’s, and Maintenance Guide