Disk-array enclosures
EMC VNX5400 Hardware Information Guide 123
Fan control module (cooling module)
Each 4U, 60 (2.5- or 3.5-inch) 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 (2.5- or 3.5-inch)
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.
Figure 103 shows the location of the status (fan fault) LED on the 4U, 60 (2.5- or 3.5-inch)
DAE fan control module.
Figure 103 Example of a 4U, 60 (2.5-3.5-inch) DAE fan control module showing the fan fault LED
Table 54 describes the 4U, 60 (2.5- or 3.5-inch) DAE fan fault LED.
LCC
Each 4U, 60 (2.5- or 3.5-inch) 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 (2.5- or
3.5-inch) 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.
Fan control module
(cooling module)
status LED
VNX-000662
Table 54 Fan control module fan fault LED
LED Color State Description
Fan fault Amber On Fault detected, one or more fans faulted
— Off No fault detected, fans operating normally
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