128 EMC VNX5400 Hardware Information Guide
VNX5400 DAE cabling
Interleaved cabling with nine DAEs in a VNX5400 Block platform
Figure 107 on page 129 shows a second example of a VNX5400 platform with nine DAEs
(all are 2U, 25 disk drive DAEs) or a VNX5400 platform with a total of 250 disk drives
(including the DPE a 3U, 25 disk drive device).
In the example (Figure 107 on page 129), the rack accommodates nine DAEs (five DAEs
for Bus 1 and four DAEs for Bus 0) along with the VNX5400 Block system for a later
upgrade to a VNX5400 File/Unified system having from 3U to 6U of space to be reserved
for one to two Control Stations and one to two Data Mover enclosures with one to four
Data Movers.
As described previously, the mini-SAS HD ports on the VNX5400 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 nine DAEs are available for a maximum of 225 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 107 on page 129,
two buses (Bus 0 and Bus 1) are available with the first DAE on Bus 1 designated as
EA0/Bus 1 (blue DAE). The second DAE continues Bus 0 and is designated as
EA1/Bus 0 (orange DAE). Then, the rest of the DAEs are intertwined where they are
daisy-chained. So, the first DAE is daisy-chained to the third DAE designated as
EA1/Bus 1, the second DAE is daisy-chained to the fourth DAE designated as EA2/Bus 0,
and so on.
The DAEs shown in Figure 107 on page 129 are:
Note: The DAE colors shown in the example are orange for Bus 0 and blue for Bus 1.
◆ EA0/Bus 1, blue DAE, DPE to 1
st
DAE (labels SP A SAS 1 to LCC A)
◆ EA0/Bus 1, blue DAE, DPE to 1
st
DAE (labels SP B SAS 1 to LCC B)
◆ EA1/Bus 0, orange DAE, DPE to 2
nd
DAE (labels SP A SAS 0 to LCC A)
◆ EA1/Bus 0, orange DAE, DPE to 2
nd
DAE (labels SP B SAS 0 to LCC B)
So, the cabling for Bus 1 is interleaved and daisy-chained through the remaining DAEs
starting with:
◆ EA1/Bus 1
While the cabling for Bus 0 is interleaved and daisy-chained through the remaining DAEs
starting with:
◆ EA2/Bus 0
The remaining cabling is daisy-chained for load balancing.
Note: In this example, Bus 0 is indicated with orange DAEs and Bus 1 is indicated with
blue DAEs.
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