EMC VNX Series Hardware Information Manual page 88

Disk-array enclosures
88 EMC VNX8000 Hardware Information Guide
1
2 3 4 5
B
A
1 LCC B AC power supply power in (recessed
plug)
2 LCC B power supply fan fault LED (on,
amber)
3 LLC B power supply LED (on, green)
4 LCC B power supply fault LED (on, amber)
5 LCC B management (RJ-12) connector to
SPS
6 LCC B SAS connector link LED
1. The DAE enclosure ID is sometimes referred to as the enclosure address (EA).
Figure 69 Example of a 3U, 15 (3.5-inch) disk drive DAE with two LCCs and two power
supply/cooling modules (rear view)
LCC
The LCC supports and controls one 6-Gb/s mini-SAS bus and monitors the DAE. A blue
link/activity LED indicates a DAE operating at 6 Gb/s.
The LCCs in a DAE connects to the SPE 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 uses protocols to emulate a loop; it 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.
Note: If the target drive is not in the LCC's enclosure, the switch passes the input signal
directly to the output 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 storage processor, which polls disk enclosure status. LCC firmware also controls the
SAS PHYs and the disk-module status LEDs.
6 7 8 9
7 LCC B SAS connector (output); labeled
with a double diamond symbol
8 LCC B SAS connector (input); labeled with
a double circle (or dot) symbol
9 LCC B bus ID
10 LCC B bus LED (fault, amber)
11 LCC B bus LED (on, green)
12 DAE enclosure ID
10 11 12
#
1
LCC B
LCC A
VNX-000100
.
.