IBM DS3950, Installation, User'S, And Maintenance Manual, Page: 44 / 252

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 DS3950 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 104 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
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IBM System Storage DS3950 Storage Subsystem: Installation, User’s, and Maintenance Guide