108 VNX5700 Hardware Information Guide
VNX5700 DAE cabling
Stacked cabling with twenty DAEs in a VNX5700 File/Unified platform
Figure 88 on page 103 shows a third example of a VNX5700 File/Unified 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 91 on page 109, 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 91 on page 109, two buses (Bus 0 and
Bus 1) are available.
The cables shown in Figure 91 on page 109 are:
◆ 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.
Note: Figure 91 on page 109 shows 6U of reserved space to allow for upgrading your
VNX5700 Block to VNX5700 File/Unified platform. If you are planning to upgrade your
Block platform to a File/Unified platform, it is recommended that at least 6U of rack space
be reserved for adding one to two Controls Stations and one to two Data Mover
enclosures.
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