46
EMC VNXe3150 Hardware Information Guide
Overview
Rear view
On the rear, viewing from top to bottom, a 2U, 25 (2.5-inch) DAE includes the following
hardware components:
◆
Two 6-Gb/s SAS LCCs (A and B)
◆
Two power supply/cooling modules
6-Gb/s SAS LCC
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 connects to the DPE and other DAEs with
6-Gb/s SAS cables. The cables connect the LCCs in a system in a daisy-chain 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.
shows an example of the rear view of a 2U, 25 (2.5-inch) disk drive
DAE.
Disk drive fault (location 4)
Amber
On
Fault has occurred
—
Off
No fault has occurred
Disk drive on/activity
(location 5)
Blue
On
Powering and powered up
Blinking
Disk drive activity
Table 23 Example of 2U, 25 (2.5-inch) DAE and the disk drive LEDs (continued)
LED
Color
State
Description