EMC VNX Series Hardware Information Manual page 117

Cabling the 6-Gb/s SAS I/O module in the VNX5500 platform
Interleaved cabling with nine DAEs in a VNX5500 Block platform
With the introduction of the 6-Gb/s SAS I/O module in the VNX5500 platform, back end
capability of the VNX5500 platform has increased. The 6-Gb/s SAS I/O module adds an
additional four back end buses to each SP in the DPE. This brings the back end busses up
from two per SP to six per SP.
more information.
VNX5500 Hardware Information Guide
This section of the
the Block and File/Unified platforms. The examples show how to cable four busses (0
through 3). Two busses through SP SAS ports 0 and 1 and four busses through the 6-Gb/s
SAS I/O module ports 0, 1, 2, and 3 (logically 2, 3, 4, and 5).
Figure 101 on page 119 shows an example of a VNX5500 Block platform with nine DAEs
(all are 2U, 25 disk drive DAEs) or a VNX5500 platform with a total of 240 disk drives (with
the DPE a 3U, 15 disk drive device).
In this example, as described previously, the SAS ports on the VNX5500 platform DPE are
physically and logically labeled 0 and 1. While the ports on the 6-Gb/s SAS I/O module on
the VNX5500 platform DPE are physically labeled 0, 1, 2, and 3 but logically 2, 3, 4, and 5.
SAS 0 is connected internally to the SAS expander that connects to the internal DPE disks.
However, since nine DAEs are available for a maximum of 240 disk drives, it is
recommended that the DAEs be load balanced. To do this, it is recommended that you
daisy chain the DAEs for the most efficient load balancing. So, in
six buses are available (Bus 0, Bus 1, Bus 2, Bus 3, Bus 4, and Bus 5).
Due to the complexity of showing the cables in a six bus system, the DAE and Bus labels
shown in Figure 101 on page 119
used.
Note: The colors for the DAE and Bus labels are orange for Bus 0, blue for Bus 1, black for
Bus 2, green for Bus 3, brown for Bus 4, and cyan for Bus 5).
EA 0/Bus 1, blue, DPE to 1
◆
EA 1/Bus 0, orange, DPE to 2
◆
EA 0/Bus 2, black, 6-Gbs SAS I/O module port 0 (SP A) to 3
◆
EA 0/Bus 3, green, 6-Gb/s SAS I/O module port 1 (SP A) to 4
◆
EA 0/Bus 4, brown, 6-Gb/s SAS I/O module port 2 (SP A) to 5
◆
EA 0/Bus 5, cyan, 6-Gb/s SAS I/O module port 3 (SP A) to 6
◆
The remaining cables are daisy-chained for load balancing. So, the blue cable for Bus 1 is
interleaved and daisy-chained through the remaining DAEs:
th
EA 1/Bus 1, 7 DAE
◆
Cabling the 6-Gb/s SAS I/O module in the VNX5500 platform
"Four-port 6-Gb/s SAS I/O module" on page 54
are color-coded to match the cabling that would be
st
DAE
nd
DAE
VNX5500 Hardware Information Guide
provides
shows cabling examples of both
Figure 101 on page
rd
DAE
th
DAE
th
DAE
th
DAE
119,
117