EMC VNX5700 - Cabling with Two DAEs in VNX5700 Block Platform

VNX5700 DAE cabling
VNX5700 Hardware Information Guide 97
IMPORTANT
Do Not connect more DAEs than the VNX5700 platform can support. When calculating the
number of drives for your VNX5700 platform, if the total drive slot quantity exceeds
between 495 and 500 depending on type of DAE installed, you will not be able to add
another DAE.
Cabling with two DAEs in a VNX5700 Block platform
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 86 on page 98 shows the first example of a VNX5700 Block 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 86 on page 98, 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. In the case of the VNX5700 platform, Bus 0 EA 0 is the
first DAE. So, to balance the load, Bus 1 EA0 becomes the second DAE (LCC A and B) in the
cabinet with the next DAE (LCC A and LCC B) as Bus 1 EA1, 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 86 on page 98 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 port 0 (SP A) to 1
st
DAE (labels SPA A0 PORT 0 to
LCC A)
◆ Cable 2, orange, 6-Gb/s SAS I/O port 0 (SP B) to 1
st
DAE (labels SPB B0 PORT 0 to
LCC B)
◆ Cable 3, blue, 6-Gb/s SAS I/O 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 port 1 (SP B) to 2
nd
DAE (labels SP B B0 PORT 1 to LCC B)