EMC VNX Series Hardware Information Manual page 75

Disk drives
Midplane
LCCs
For more information about the drive carrier in a 3U, 120 or 4U, 60 DAE, see the
(2.5-inch) DAE (DAE8S)"
(DAE7S)" section on page
Each disk drive consists of one disk drive in a carrier. You can visually distinguish
between disk drive types by their different latch and handle mechanisms and by type,
capacity, and speed labels on each disk drive. You can add or remove a disk drive while
the DAE is powered up, but you should exercise special care when removing disk drives
while they are in use. Disk drives are extremely sensitive electronic components.
In a 2U, 25 or 3U, 15 DAE, a midplane separates the front-facing disk drives from the
rear-facing LCCs and power supply/cooling modules. It distributes power and signals to
all components in the enclosure. LCCs, power supply/cooling modules, and disk drives
plug directly into the midplane.
In a 2U, 25 or 3U, 15 DAE, an LCC supports, controls, and monitors the DAE, and is the
primary interconnect management element. Each LCC includes connectors for input and
expansion to downstream devices. An enclosure address (EA) indicator is located on each
LCC (Figure 65 on page 83
identification indicator (Figure 65 on page 83
In a 3U, 120 DAE, an LCC supports, controls, and monitors the DAE, and is the primary
interconnect management element. Each LCC includes connectors for input and
expansion to downstream devices. An enclosure address (EA) indicator is located on each
LCC (Figure 101 on page
indicator (Figure 101 on page
In a 4U, 60 DAE, the primary functionality of an LCC is to be a SAS expander as well as to
provide enclosure services to all the disk drives (60 in all). In other words, the LCC in a 4U
DAE (Figure 111 on page
Sub-system (CDES) architecture. CDES consists of the PMC-Sierra PM8005 SXP 6G SAS
expander, the Common Disk Enclosure FPGA (CDEF) and supporting logic.
In the 4U, 60 DAE LCC, two SAS expanders are available. As previously described, the SAS
expanders are PMC-Sierra SXP36 6G (PM8005, rev C) components. Each expander
functions or operates separately. That is, each expander has its own CDEF and supporting
logic to support 30 drives each. A 4-lane SAS wide port connecting each expander to the
Inter Connect Module (ICM) expander on the same side (A or B) of the 4U DAE is available.
Each expander manages the drives it is connected to. The only shared resources are the
LCC LED and the expander I
12. The EA is sometimes referred to as an enclosure ID.
section on page 94 and the
111.
and Figure 73 on page
and
11
119) . Each LCC also includes a bus (loop) identification
119).
129) implements a version of the Common Disk Enclosure
2
C (inter-integrated circuit) bus.
EMC VNX8000 Hardware Information Guide
Disk-array enclosures
"4U, 60 (2.5- or 3.5-inch) DAE
12
92) . Each LCC includes a bus (loop)
Figure 73 on page 92).
"3U, 120
75