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Dell PowerStore Hardware Information Guide for PowerStore 500T Model

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NVMe expansion enclosure LCC

About LCCs

Each NVMe expansion enclosure contains two LCCs, and each LCC contains an Access Module and a Drive Interface Board that is located behind the Access Module. The Drive Interface Board connects the front-end to the back-end and contains the PCIe switches that connect the drives and the Access Module.

The Access Module manages and reports the environmental conditions of the NVMe expansion enclosure such as power, thermal, status indicators, and component presence. The Access Module employs NVMe-oF (NVMe over Fabrics) technology by using RDMA over Converged Ethernet (RoCE) for Ethernet. This technology allows the Access Module to perform the translation of the persistent storage data received over the Ethernet interfaces and transfer it onto the PCIe connections of the NVMe drives. The Access Module also applies the data protection that is deployed by the system.

The Access Module contains the following components:

  • Two 100GbE ports (QSFP28) for connecting the NVMe expansion enclosure to the base enclosure and for daisy chaining additional NVMe expansion enclosures.
  • One micro USB port (not used)
  • One USB port (not used)
  • Two 1GbE RJ45 management ports (for support only)

The following figure shows the location of these components:

Figure 1. Access Module rear view with component locations
Access Module rear view with component locations
Table 1. Access Module component locationsColumn one lists the component locations, and column two provides descriptions.
Location Description
1 100GbE ports (QSFP28)
2 Micro USB port (not used)
3 USB port (not used)
4 1GbE RJ45 management ports (for support only)
Figure 2. Access Module LEDs
Access Module LEDs
Table 2. Access Module LEDsColumn one lists the LEDs, and the other columns provide the location, state, and description.
LED Location State Description
Power status 1 Green Power on.
Off Power off.
Fault status 2 Amber Faulted hardware.
Off No fault has occurred. Normal operation.
System ID 3 Blinking blue System ID mode is enabled.
Off System ID mode is not enabled.
Daisy chain ID 4 50–52 Identifies where in the daisy chain the expansion enclosure is located:
  • 50 - First expansion enclosure
  • 51 - Second expansion enclosure
  • 52 - Third expansion enclosure

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