EMC VNX Series Hardware Information Manual page 115

Stacked cabling in a VNX5500 File/Unified platform with nine DAEs
Figure 100 on page 116 shows a third 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). This example shows the
stacked cabling with one 40U rack having nine DAEs.
In this example, as described previously, the SAS ports on the VNX5500 File/Unified
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 240 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 100 on page 116, two buses (Bus 0 and Bus 1) are available.
The cables shown in Figure 100 on page 116
Cable 1, blue, DPE to 5
◆
Cable 2, blue, DPE to 5
◆
Cable 3, orange, DPE to 1
◆
Cable 4, orange, DPE to 1
◆
So, the blue cable for Bus 1 is 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 daisy-chained through the remaining DAEs:
EA 2/Bus 0
◆
EA 3/Bus 0
◆
EA 4/Bus 0
◆
are:
th
DAE (labels SP A SAS 1 to LCC A)
th
DAE (labels SP B SAS 1 to LCC B)
st
DAE (labels SP A SAS 0 to LCC A)
st
DAE (labels SP B SAS 0 to LCC B)
VNX5500 Hardware Information Guide
VNX5500 DAE cabling
115