144 EMC VNX8000 Hardware Information Guide
VNX8000 DAE cabling
Cabling with two DAEs in a VNX8000 File/Unified platform
The examples for the File/Unified systems described in this guide are only examples of
how you can cable you VNX8000 system.
Shown in the upcoming figure (Figure 120 on page 146) is an example of SAS cabling in a
SPE-based VNX storage platform, the VNX8000 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 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 120 on page 146 shows the first example of a VNX8000 File/Unified platform with
two DAEs (one 3U, 15 disk drive DAE and the other a 2U, 25 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 and 1.
In Figure 120 on page 146, 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 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: 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.
Notice the description of the cable labels affixed to the SP to DAE cables.
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