EMC VNX5700 - Cabling with two DAEs in a VNX5700 File;Unified platform

104 VNX5700 Hardware Information Guide
VNX5700 DAE cabling
Cabling with two DAEs in a VNX5700 File/Unified platform
Shown in the upcoming figures (Figure 89 on page 105, Figure 90 on page 107, and
Figure 91 on page 109) are graphical representations of SAS cabling in an SPE-based VNX
storage platform, the VNX5700 File/Unified. The Storage Processors connect to the DAEs
with SAS cables. The cables connect LCCs in the DAEs of a storage platform in a
daisy-chain topology.
The first DAE connected to the Storage Processor SAS output port 0 is designated
Enclosure 0 (EA 0). Each DAE connected after the first DAE increments the enclosure
number by one. All enclosures connected to SAS Port 0 show an ID of 0, but the addresses
will increment.
Figure 89 on page 105 shows the first example of a VNX5700 File platform with two DAEs
(one 3U, 15 disk drive DAE and the other a 2U, 25 disk drive DAE) or a VNX5700 platform
with a total of 40 disk drives.
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 89 on page 105, notice that each DAE device supports two completely redundant
buses (LCC A and LCC B).
The rule of load or bus balancing is applied to all DAEs. That is, Bus 0 is Enclosure Address
0 (EA 0), Bus 1 is EA 0, and so on. If you have several DAEs in your VNX5700 platform, you
can daisy chain them within that particular bus. However, it is recommended that you
balance each bus. In other words, always optimize your environment by using every
available bus, and spreading the number of enclosures as evenly as possible across the
buses.
Note: On the DAE, each cable connector includes a symbol to denote the direction the
cable needs to connect to. The cable connector that has a double circle symbol is the
input to the device. The cable connector with the double diamond symbol is the output
from the device.
IMPORTANT
Notice the description of the cable labels affixed to the SP to DAE cables.
The cables shown in Figure 90 on page 107 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 2
nd
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 2
nd
DAE (labels SP B B0 Port 1
to LCC B)