106 VNX5700 Hardware Information Guide
VNX5700 DAE cabling
Interleaved cabling in a VNX5700 File/Unified platform with twenty DAEs
Figure 90 on page 107 shows an example of a VNX5700 File/Unified platform with twenty
DAEs (all are 2U, 25 disk drive DAEs) or a VNX5700 File platform with a total of 500 disk
drives. This example has two 40U racks with the first rack having ten DAEs and the second
rack having ten DAEs.
In this example, the SAS ports on the VNX5700 platform DPE are labeled 0 and 1.
However, since twenty DAEs are available for a maximum of 500 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 90 on page 107,
two buses (Bus 0 and Bus 1) are available with the first DAE on Bus 0 designated as EA
0/Bus 0 (orange cable). The second DAE continues Bus 1 and is designated as EA 0/Bus 1
(blue cable) where it is then interleaved and daisy-chained to remainder of the DAEs.
The cables shown in Figure 90 on page 107 are:
Note: The cable colors shown in the example are orange for Bus 0 and blue for Bus 1.
◆ Cable 1, orange, 6-Gb/s SAS I/O module port 0 (SP A) to 1
st
DAE (labels SP A A0 Port 0
to LCC A)
◆ Cable 2, orange, 6-Gb/s SAS I/O module port 0 (SP B) to 1
st
DAE (labels SP B B0 Port 0
to LCC B)
◆ Cable 3, blue, 6-Gb/s SAS I/O module port 1 (SP A) to 2
nd
DAE (labels SP A A0 Port 1 to
LCC A)
◆ Cable 4, blue, 6-Gb/s SAS I/O module port 1 (SP B) to 2
nd
DAE (labels SP B B0 Port 1
to LCC B)
The remaining cables are daisy-chained for load balancing. So, the orange cable for Bus 0
is interleaved and daisy-chained through the remaining DAEs:
◆ EA 1/Bus 0
◆ EA 2/Bus 0
◆ EA 3/Bus 0
◆ EA 4/Bus 0
While the blue cable for Bus 1 is interleaved and daisy-chained through the remaining
DAEs:
◆ EA 1/Bus 1
◆ EA 2/Bus 1
◆ EA 3/Bus 1
◆ EA 4/Bus 1
Note: In Figure 90 on page 107 the VNX5700 File platform shows a dual 1U SPS, an SPE
(with two SPs), two CSs (one optional), two DMEs (with four DMs), and twenty 2U 25 DAEs.
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