VNX5500 DAE cabling
VNX5500 Hardware Information Guide 113
Interleaved cabling in a VNX5500 File/Unified platform with nine DAEs
Figure 99 on page 114 shows an example of a VNX5500 File/Unified platform with nine
DAEs (all are 2U, 25 disk drive DAEs) or a VNX5500 File/Unified platform with a total of
240 disk drives (with the DPE a 3U, 15 disk drive device).
In this example, the SAS ports on the VNX5500 platform DPE are labeled 0 and 1. SAS 0 is
connected internally to the SAS expander that connects to the internal DPE disks.
However, since four DAEs for a maximum of 240 disk drives are available, 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 99 on page 114,
two buses (Bus 0 and Bus 1) are available with the first DAE on Bus 1 designated as
EA0/Bus 1 (blue cable). The second DAE continues Bus 0 and is designated as EA1/Bus 0
(orange cable) where it is then daisy-chained to the fourth DAE designated as EA2/Bus 0
and then to the sixth DAE designated as EA3/Bus 0, and so on.
The cables shown in Figure 99 on page 114 are:
Note: The cable colors shown in the example are orange for Bus 0 and blue for Bus 1.
◆ Cable 1, blue, DPE to 1
st
DAE (labels SP A SAS 1 to LCC A)
◆ Cable 2, blue, DPE to 1
st
DAE (labels SP B SAS 1 to LCC B)
◆ Cable 3, orange, DPE to 2
nd
DAE (labels SP A SAS 0 to LCC A)
◆ Cable 4, orange, DPE to 2
nd
DAE (labels SP B SAS 0 to LCC B)
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 2/Bus 1
◆ EA 3/Bus 1
◆ EA 4/Bus 1
While the orange cable for Bus 0 is interleaved and daisy-chained through the remaining
DAEs:
◆ EA 2/Bus 0
◆ EA 3/Bus 0
◆ EA 4/Bus 0
Note: In Figure 99 on page 114 the VNX5500 File/Unified platform shows a dual 1U SPS, a
DPE (with two SPs), two CSs, two DMEs (with three DMs), and nine 3U 15 DAEs.
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