VNX5500 DAE cabling
VNX5500 Hardware Information Guide 105
The VNX5500 platform supports two types of DPEs and DAEs; a 15 drive 3.5-inch disk 3U
enclosure and a 25 drive 2.5-inch disk 2U enclosure. Expansion of up to fifteen 3U DAEs
(a maximum of 240 3.5-inch disk drives) or up to nine 2U DAEs (a maximum of 250
2.5-inch disk drives).
Do Not
connect more DAEs than the VNX5500 platform can support. When calculating the
number of drives for your VNX5500 platform, the 3U DPE is included in the total drive slot
quantity of 240 to 250 drives. If the total drive slot quantity exceeds 240 or 250, you will
not be able to add another DAE.
Cabling with two DAEs in a VNX5500 Block platform
The first DAE connected to the Storage Processor SAS output port 1 is designated
Enclosure 0 (EA0). 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, but the
addresses will increment.
Figure 95 on page 106 shows the first example of a VNX5500 Block platform with two
DAEs (one 3U, 15 disk drive DAE and the other a 2U, 25 disk drive DAE) or a VNX5500
platform with a total of from 55 disk drives (if the DPE is a 3U, 15 disk drive device) or 65
disk drives (if the DPE is a 3U, 25 disk drive device).
The SAS ports on the VNX5500 platform DPE are labeled 0 and 1. SAS 0 is connected
internally to the SAS expander that connects the internal 3U DPE disks. Since SAS 0 is
already connected internally to the DPE disks, the first DAE is connected to SAS 1 to
balance the load on the SAS ports. The second DAE is connected to SAS 0, the third DAE is
connected to SAS 1, and so on.
In Figure 95 on page 106, 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 VNX5500 platform, Bus 0 EA0
is the DPE (SP A and B). So, to balance the load, Bus 1 EA0 becomes the first DAE (LCC A
and B) in the cabinet with the next DAE (LCC A and LCC B) as Bus 0 EA1, and so on. If you
have several DAEs in your VNX5500 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 DPE and 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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