EMC VNX5500 - Page 94

94 VNX5500 Hardware Information Guide
Disk-array enclosure
LCC
Each 4U, 60 DAE includes two LCCs. The primary function of each LCC is to be a SAS
expander providing services to 30 drive slots per LCC in the 4U, 60 DAE.
The LCC implements Common Disk Enclosure Subsystem (CDES). CDES consists of a
6-Gb/s SAS expander, Common Disk Enclosure FPGA (CDEF), and supporting logic.
The primary components on the LCC are the two SAS expanders. A four lane SAS wide port
connecting each expander to the ICM expander on the same side (A or B) of the 4U, 60
DAE is available. Each LCC independently monitors the environmental status of the entire
enclosure, using a microcomputer-controlled monitor program. The monitor
communicates the status to the storage processor, which polls disk enclosure status.
Figure 84 shows the location of the status LEDs on the 4U, 60 DAE LCC.
Figure 84 Example of 4U, 60 DAE LCC A showing the status LEDs
Table 50 describes the 4U, 60 DAE LCC status LEDs.
Fan control module (cooling module)
Each 4U, 60 DAE includes three fan control modules (cooling modules) located on the
front of the DAE. The fan control module includes a fan, fuse, and microcontroller with an
I
2
C interface inside a rugged enclosure.
The fan control module augments the cooling capacity of each 4U, 60 DAE. It plugs
directly into the DAE baseboard from the top of the DAE. Inside the fan control module,
sensors measure the external ambient temperatures to ensure even cooling throughout
the DAE.
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LCC A
Power fault LED (amber) VNX-000654Power LED (green)
Table 50 LCC status LEDs
Led Color State Description
Power Green On Power on
—OffPower off
Power fault Amber On Fault
— Off No fault or power off