EMC VNX Series Hardware Information Manual page 71

The 3U, 15 (3.5-inch) DAE rear view
6-Gb/s SAS LCC
Table 39 3U, 15 (3.5-inch) DAE and disk drive LEDs (continued)
LED
Disk drive on/activity
(location 5)
On the rear, viewing from top to bottom
includes the following hardware components:
Two 6-Gb/s SAS LCCs (A and B)
◆
Two power supply/cooling modules
◆
The LCC supports and controls one 6-Gb/s SAS bus and monitors the DAE. A blue
link/activity LED indicates a DAE operating at 6 Gb/s.
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.
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.
Color State
Green On
Blinking, mostly
on
Blinking at
constant rate
Blinking, mostly
off
— Off
(Figure 63 on page
EMC VNX5300 Hardware Information Guide
Disk-array enclosure
Description
Powering and powered up
Disk drive is on with I/O activity
Disk drive is spinning up or down
normally
Disk drive is powered up but not
spinning
Note: This is a normal part of the
spin-up sequence, occurring
during the spin-up delay of a
slot.
Disk is powered down
72), a 3U, 15 (3.5-inch) DAE
71