System component description
41
Overview
Looking from left to right,
shows an example of the rear view of a 2U, 12
(3.5-inch) disk drive DAE.
Figure 25 DAE with two LCCs and two power supply/cooling modules (rear view)
Note: On the rear of the DAE, looking from left to right,
shows LCC B and LCC A,
respectively.
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 (physical links) and the disk-drive status LEDs.
shows the location of the enclosure ID indicator
7
on each LCC. Each LCC also
includes a bus (back-end port) identification indicator. The SP initializes the bus ID when
the operating system is loaded.
1
LCC B AC power supply power in (recessed
plug)
7
LCC B fault LED (on, amber)
2
LCC B power supply LED (on, green)
8
DAE enclosure ID
1
1. The DAE enclosure ID is sometimes referred to as the enclosure address (EA).
3
LCC B power supply fault LED (on, amber)
9
LCC B loop bus ID
4
LCC B power supply fan fault LED (on,
amber)
10
LCC B SAS connector (input); labeled with
a double circle (or dot) symbol
.
5
LCC B right latch handle
11
LCC B SAS connector (output); labeled
with a double diamond symbol
.
6
LCC B power LED (on, green)
X4
6Gb SAS
1
#
X4
6Gb SAS
1
X4
6Gb SAS
1
#
X4
6Gb SAS
LCC A
LCC B
2
3
4
5
8
7
9
10
11
6
VNX-000091
7. The enclosure ID is sometimes referred to as the enclosure address (EA).
