EMC VNX5500 - Interleaved cabling in a VNX5500 File;Unified platform with nine DAEs

120 VNX5500 Hardware Information Guide
Cabling the 6-Gb/s SAS I/O module in the VNX5500 platform
Interleaved cabling in a VNX5500 File/Unified platform with nine DAEs
Figure 102 on page 121 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 Figure 102 on page 121,
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 102 on page 121 are color-coded to match the cabling that would be
used.
Note: The cable 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
st
DAE
◆ EA 1/Bus 0, orange, DPE to 2
nd
DAE
◆ EA 0/Bus 2, black, 6-Gbs SAS I/O module port 0 (SP A) to 3
rd
DAE
◆ EA 0/Bus 3, green, 6-Gb/s SAS I/O module port 1 (SP A) to 4
th
DAE
◆ EA 0/Bus 4, brown, 6-Gb/s SAS I/O module port 2 (SP A) to 5
th
DAE
◆ EA 0/Bus 5, cyan, 6-Gb/s SAS I/O module port 3 (SP A) to 6
th
DAE
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:
◆ EA 1/Bus 1, 7
th
DAE
While the orange cable for Bus 0 is interleaved and daisy-chained through the remaining
DAEs:
◆ EA 2/Bus 0, 8
th
DAE
While the black cable for Bus 2 is interleaved and daisy-chained through the remaining
DAEs:
◆ EA 1/Bus 2, 9
th
and final DAE
Note: In Figure 102 on page 121 the VNX5500 File/Unified platform shows a dual 1U SPS,
a DPE (with two SPs), two CSs, a two DMEs (with three DMs), and nine 3U 15 DAEs.