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Dell PowerStore Hardware Information Guide for PowerStore 1000, 1200, 3000, 3200, 5000, 5200, 7000, 9000, and 9200

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SAS expansion enclosure link control card

Link control card functions and features

The link control card (LCC) supports, controls, and monitors the SAS expansion enclosure, and is the primary interconnect management element. Each LCC includes connectors for input and output to downstream devices.

The LCCs in a SAS expansion enclosure connect to the node and other expansion enclosures. The cables connect the LCCs in a system in a daisy-chain topology.

Internally, each SAS expansion enclosure LCC uses protocols to emulate a loop. The LCC connects to the drives in its enclosure in a point-to-point fashion through an internal switch. The LCC independently receives and electrically terminates incoming signals. For traffic from the node, the LCC switch passes the signal from the input port to the drive being accessed. The switch then forwards the drive output signal to the port.

Each LCC independently monitors the environmental status of the entire enclosure, using a microcomputer-controlled monitor program. The monitor communicates the status to the nodes, which poll the SAS expansion enclosure status. LCC firmware also controls the SAS and drive-module status LEDs.

Each LCC includes an enclosure ID display.

12-Gb/s LCC ports, LEDs, and connectors

Each SAS expansion enclosure LCC shows the following ports, LEDs, and connectors:

Figure 1. SAS expansion enclosure LCC ports, LEDs, and connectors
SAS expansion enclosure LCC ports, LEDs, and connectors
Table 1. SAS expansion enclosure LCC component locationsColumn one lists the location of the components, and column two provides descriptions.
Location Description
1 Ejector latch handles
2 LCC fault LED
3 LCC management port (RJ-12) (not used)
4 Back-end bus ID display (always displays 01)
5 LCC power LED
6 Enclosure ID display
7 12-Gb/s SAS ports
8 SAS port status LED
Table 2. 12-Gb/s LCC LED statusColumn one lists the LEDs, and the other columns provide the location, color, state, and description.
LED Location Color State Description
LCC fault LED 2 Amber On Fault within the LCC
— Off No fault or powered off
LCC power LED 5 Green On Powered on and no fault
— Off Powered off
SAS port status LED 8 Amber On SAS port faulted
Blue On SAS port linked up
— Off No connector in port

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