EMC VNX5500 - Stacked Cabling with Nine DAEs in a VNX5500 Block Platform

VNX5500 DAE cabling
VNX5500 Hardware Information Guide 109
Stacked cabling with nine DAEs in a VNX5500 Block platform
Figure 97 on page 110 shows a third example of a VNX5500 Block platform with nine
DAEs (all are 2U, 25 disk drive DAEs) or a VNX5500 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 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 97 on
page 110, two buses (Bus 0 and Bus 1) are available.
The cables shown in Figure 97 on page 110 are:
Note: The cable colors shown in the example are orange for Bus 0 and blue for Bus 1.
◆ Cable 1, blue, DPE to 5
th
DAE (labels SP A SAS 1 to LCC A)
◆ Cable 2, blue, DPE to 5
th
DAE (labels SP B SAS 1 to LCC B)
◆ Cable 3, orange, DPE to 1
st
DAE (labels SP A SAS 0 to LCC A)
◆ Cable 4, orange, DPE to 1
st
DAE (labels SP B SAS 0 to LCC B)
So, the blue cable for Bus 1 is daisy-chained through the remaining DAEs:
◆ EA 1/Bus 1
◆ 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
Note: Figure 97 on page 110 shows 6U of reserved space to allow for upgrading your
VNX5500 Block to VNX5500 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.