VNX5700 DAE cabling
VNX5700 Hardware Information Guide 101
Stacked cabling with twenty DAEs in a VNX5700 Block platform
Figure 88 on page 103 shows a third example of a VNX5700 Block platform with twenty
DAEs (all are 2U, 25 disk drive DAEs) or a VNX5700 platform with a total of 500 disk
drives. This example shows the stacked cabling with two 40U racks, the first rack having
fifteen DAEs and the second and final rack having five DAEs.
Note: In the example in Figure 88 on page 103, the 2U, 25 disk drive DAE is used. If you
want to use the 3U, 15 disk drive DAE, three 40U racks would be necessary. Each 40U rack
can accommodate up to thirteen DAEs (ten DAEs per Bus) without difficulty. So, in this
situation, the first rack would have nine DAEs (reserving 6U of space for File hardware).
The second rack would have thirteen DAEs. And, the third and final rack would have
eleven DAEs for a total DAE count of thirty-three having a disk drive count of 495.
The SAS ports on the 6-Gb/s SAS I/O module in each SP of the VNX5700 platform SPE are
labeled 0 and 1.
In Figure 88 on page 103, notice that each DAE device supports two completely redundant
buses (LCC A and LCC B).
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 88 on page 103, two buses (Bus 0 and
Bus 1) are available.
The cables shown in Figure 88 on page 103 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 11
th
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 11
th
DAE (labels SP B B0 Port 1
to LCC B)
So, the orange cable for Bus 0 is stacked and daisy-chained through the remaining DAEs:
◆ EA 1/Bus 0
◆ EA 2/Bus 0, and continue stacking the DAEs up to EA 9/Bus 0.
While the blue cable for Bus 1 is stacked and daisy-chained through the remaining DAEs:
◆ EA 1/Bus 1
◆ EA 2/Bus 1, and continue stacking the DAEs up to EA 9/Bus 1.
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