132 EMC VNX8000 Hardware Information Guide
VNX8000 DAE cabling
Cabling with two DAEs in a VNX8000 Block platform
The examples for the Block systems described in this guide are only examples of how you
can cable you VNX8000 system.
The first DAE connected to the SAS I/O module in slot 5 port 0 is designated Enclosure 0
(EA0). Each DAE connected after the first DAE increments the enclosure number by one.
All enclosures connected to the SAS I/O module in slot 5 Port 0 will show an ID of 0, but
the addresses will increment.
Figure 113 on page 133 shows the first example of a VNX8000 Block platform with two
DAEs (a 2U, 25 disk drive DAE and a 3U, 15 disk drive DAE) or a VNX8000 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 VNX8000 platform 4U SPE
are labeled 0, 1, 2, and 3.
In Figure 113 on page 133, 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 (EA0), Bus 1 is EA0, and so on. In the case of the VNX8000 platform, Bus 0 EA0
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 VNX8000 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: When connecting multiple DAEs, each cable connector on the DAE includes a
symbol to denote the direction the cable needs to connect to. The cable connector on the
DAE that has a double circle symbol
is the input to the device. The cable connector
on the DAE with the double diamond symbol is the output from the device.
The cables shown in Figure 113 on page 133 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 SP A SAS 5 Port 0 to
LCC A)
◆ Cable 2, orange, 6-Gb/s SAS I/O port 0 (SP B) to 1
st
DAE (labels SP B SAS 5 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 SAS 5 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 SAS 5 Port 1 to
LCC B)
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