IBM DS3500, Инструкция по установке, эксплуатации и обслуживанию

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adapters installed in the controllers.
Environmental service modules
The EXP3500 expansion enclosure comes with a single ESM. An optional ESM is
available for redundant configurations. If the RAID controller connected to the ESM
supports more than one EXP3500 expansion enclosure per physical port, you can
connect two or more EXP3500 expansion enclosures by chaining them together.
For information about connecting an EXP3500 expansion enclosure to a DS3500
storage subsystem, see “Connecting expansion enclosures to the DS3500” on page
40.
Figure 8 shows an EXP3512 expansion enclosure containing one ESM and a filler
panel over the blank ESM bay.
Power supply and fans
The DS3500 storage enclosure and EXP3500 expansion enclosure have two
removable power supplies. Each power supply contains two fans. The four fans pull
air through the drives from front to back across the drives.
The fans provide redundant cooling, which means that if one fan fails, the remaining
fans continue to provide sufficient cooling to operate the storage subsystem or
expansion enclosure. If one power supply is turned off or malfunctions, the other
power supply maintains electrical power to the storage subsystem or expansion
enclosure. To preserve the optimal airflow, do not remove a failed power supply
from the chassis until you are ready to replace it with a new power supply.
Figure 9 on page 11 shows the power supply components.
Hot-swap power supplies
RAID controller A
Filler panel
Figure 7. Rear view, single-controller model (shown without an optional host port adapter)
Hot-swap power supplies
Filler panel
ESM
1 2
ESM
Figure 8. Rear view, single ESM model expansion enclosure
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System Storage DS3500 and EXP3500: Installation, User’s, and Maintenance Guide