EMC2 VNX VNX7500 Hardware Information Manual page 105

Cabling with two DAEs in a VNX7500 File/Unified platform
Shown in the upcoming figures
Figure 93 on page 112) are graphical representations of SAS cabling in an SPE-based VNX
storage platform, the VNX7500 File. 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 will show an ID of 0.
Figure 91 on page 108 shows the first example of a VNX7500 File/Unified platform with
two DAEs (one 3U, 15 disk drive DAE and the other a 2U, 25 disk drive DAE) or a VNX7500
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 VNX7500 platform SPE are
labeled 0 and 1.
In Figure 91 on page 108, 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 VNX7500 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 91 on page 108
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
◆
to LCC A)
Cable 2, orange, 6-Gb/s SAS I/O module port 0 (SP B) to 1
◆
to LCC B)
Cable 3, blue, 6-Gb/s SAS I/O module port 1 (SP A) to 2
◆
LCC A)
Cable 4, blue, 6-Gb/s SAS I/O module port 1 (SP B) to 2
◆
to LCC B)
(Figure 91 on page 108, Figure 92 on page
are:
EMC VNX7500 Hardware Information Guide
VNX7500 DAE cabling
111, and
st
DAE (labels SP A A0 Port 0
st
DAE (labels SP B B0 Port 0
nd
DAE (labels SP A A0 Port 1 to
nd
DAE (labels SP B B0 Port 1
107