storage subsystem are shown in the released position. The levers that secure the
right power supply and fan unit into the storage subsystem are shown in the latched
position.
Note:
Although both power supply and fan units in the DS5100 and DS5300
chassis are identical, they are seated in the DS5100 and DS5300 chassis in
opposite orientations. The left and right power supply and fan units are
installed so that the LED column of each power supply and fan unit is
located towards the interior of the DS5100 and DS5300, along the side of
the interconnect-battery unit.
Information about the condition of the power supplies, fans, and battery charger is
conveyed by indicator lights (LEDs) on the front of each of the power supply and
fan units and on the interconnect-battery unit. You must remove the front bezel to
see the LEDs. (“Power supply and fan unit LEDs” on page 152 identifies the
indicator LEDs on a power supply and fan unit and explains the conditions that
each LED indicates.)
Note:
The order of the LEDs on the power supply and fan unit is different
depending on whether the power supply and fan unit is installed in the left or
right bay.
In the DS5100 and DS5300, the right power supply and fan unit is linked to
controller A, and the left power supply and fan unit is linked to controller B. To
increase protection against power loss, always make sure that both power supply
and fan units are operational.
Interconnect-battery unit
The interconnect-battery unit is a removable midplane that provides cross-coupled
signal connection between the controllers. The control output from each controller is
connected to the control input in the alternate controller. An audible alarm is
mounted on the interconnect-battery unit display board. A mute switch for the
audible alarm is also mounted on the same board. The interconnect-battery unit
also provides the electrical communication path between the power supply and fan
units and allows their power supplies to load-share and to charge the cache-backup
battery packs. There are two cache-backup battery packs mounted inside the
interconnect-battery unit.
Latch
Latch
Power supply and
fan units
Levers in
released
position
Levers in
latched
position
ds50016
Figure 7. Power supply and fan unit
20
IBM System Storage DS5100 and DS5300 Storage Subsystem: Installation, User’s, and Maintenance Guide