3. The Module Fault LED is on when there is a system hardware fault. A Power
Cooling Module (PCM) or an I/O module may be at fault.
4. The Logical Status LED shows a change of status or a fault, typically associated
with the shelf's disk drives. This LED also indicates an issue with an internal
RAID controller or external RAID controller, or with a host bus adapter.
5. The Unit Identification Display provides information to assist in the configuration
of multiple storage shelves.
Storage shelf rear panel
The rear panel of the storage shelf contains two main components; two Power
Cooling Modules (PCMs) and two I/O Module canisters.
The PCMs, located on the left and the right sides of the storage shelf, contain fans.
The I/O module canisters are located in the center of the rear panel, one above the
other. Each I/O module contains three SAS-3 ports; A, B, and C. The SAS ports
connect the I/O modules to the appliance and to other storage shelves. Note that
the port labels are reversed on the bottom canister. Port C is not used at this time.
The PCMs and the I/O modules include LEDs.
Cables
Two power cables are shipped with each appliance and each storage shelf.
1m SAS-3 cables are shipped with each storage shelf. The one-meter cables are
sufficient when the recommended cabling scheme is followed. 3m SAS-3 cables
are available separately in case of need.
Hardware overview
Storage shelf rear panel
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