EMC VNX Series Hardware Information Manual page 79

2U, 25 (2.5-inch) DAE rear view
6-Gb/s SAS LCC
On the rear, viewing from top to bottom, a 2U, 25 (2.5-inch) DAE includes the following
hardware components:
Two LCCs (A and B)
◆
Two power supply/cooling modules
◆
Figure 70 shows an example of the rear view of a 2U, 25 (2.5-inch) disk drive DAE.
1 2 3
1 LLC B power supply LED (on, green)
2 LCC B power supply fault LED (on, amber)
3 LCC B AC power supply power in (recessed
plug)
4 LCC B SAS connector link LED (on, blue)
5 LCC B SAS connector (input); labeled with
a double circle (or dot) symbol
6 LCC B SAS connector (output); labeled
with a double diamond symbol
1. The DAE enclosure ID is sometimes referred to as the enclosure address (EA).
Figure 70 Example of a 2U DAE with two LCCs and two power supply/cooing modules (rear view)
The 6-Gb/s SAS LCC supports, controls, and monitors the DAE, and is the primary
interconnect management element. Each LCC includes connectors for input and output to
downstream devices.
As described previously, the LCCs in a DAE connect to the DPE and other DAEs with 6-Gb/s
cables. The cables connect the LCCs in a system in a daisy-chain (loop) topology.
Internally, each DAE LCC connects to the drives in its enclosure in a point-to-point fashion
through a switch. The LCC independently receives and electrically terminates incoming
signals. For traffic from the system's storage processors, 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.
4 5 6 7
8 9
B
#
12
7 LCC B bus ID
8 LCC B power and fault LEDs
9 DAE enclosure ID
10 LCC B management (RJ-12) connector to
SPS (not used)
11 LCC A power supply latch handle
.
12 LCC A right latch handle
.
EMC VNX5300 Hardware Information Guide
Disk-array enclosure
10
A
1
11
VNX-000280
79