- Notes, cautions, and warnings
- Additional resources
- Platform Overview
- Technical specifications
- Hardware component descriptions
- Disk-array enclosures
- Cabling
- Rail kits and cables
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Dell Unity™ All Flash and Unity Hybrid Hardware Information Guide
12Gb/s SAS cabling for stacked DAE configurations
The stacked DAE configuration is another one of the racking methods available when installing optional DAEs. A stacked configuration is when the optional DAEs within a back-end loop are installed one on top of the other until all the DAEs in that loop are installed into the rack. Then, the next set of DAEs in the next back-end loop are installed.
About stacked DAE cabling conventions
The stacked DAE example with Unity platform with nineteen DAEs (all are 2U, 25 drive DAEs) with a total of 500 drives (including the 25 drives in the DPE) across six back-end buses. As described previously, the onboard SAS ports on the DPE are labeled 0 and 1 and the optional SAS module, where supported, contains four additional SAS ports.
DPE SAS port 0 is connected internally to the SAS expander that connects to the front-facing drives in the DPE and thus begins back-end bus 0 and is enclosure 0 on this back-end (BE0 EA0). So when cabling the first expansion DAE, to balance the load, this DAE is cabled to DPE SAS port 1 to begin back-end bus 1 as enclosure 0 (BE1 EA0). Then, the rest of the DAEs in the bus are daisy-chained where they are stacked. So, the 1st DAE is daisy-chained to the 2nd DAE designated as BE1 EA1, and so on.
The 5th DAE connects to DPE SAS port 0 to extend back-end bus 0 as enclosure 1 (BE0 EA1) and is daisy-chained to the 6th DAE, designated as BE0 EA2, and so on.
The 8th DAE connects to DPE SAS module port 0 to begin back-end bus 2 as enclosure 0 (BE2 EA0) and is daisy-chained to the 9th DAE, designated as BE2 EA1, and so on.
The 11th DAE connects to DPE SAS module port 1 to begin back-end bus 3 as enclosure 0 (BE3 EA0) and is daisy-chained to the 12th DAE, designated as BE3 EA1, and so on.
The 14th DAE connects to DPE SAS module port 2 to begin back-end bus 4 as enclosure 0 (BE4 EA0) and is daisy-chained to the 15th DAE, designated as BE4 EA1, and so on.
Finally, the 17th DAE connects to DPE SAS module port 3 to begin back-end bus 5 as enclosure 0 (BE5 EA0) and is daisy-chained to the 18th DAE, designated as BE5 EA1, and so on.
19 2U DAEs in a stacked configuration across 6 back-end buses
| Example: | DAE number and address | DAE port connections | |
|---|---|---|---|
| Port A (Input) | Port B (Output) | ||
 | 5_2/DAE 19 - BE 5 EA 2 (Cyan) | Connected to DAE 18 | Not connected |
| 5_1/DAE 18 - BE 5 EA 1 (Cyan) | Connected to DAE 17 | Connected to DAE 19 | |
| 5_0/DAE 17 - BE 5 EA 0 (Cyan) | Connected to DPE 0 port 3 | Connected to DAE 18 | |
| 4_2/DAE 16 - BE 4 EA 2 (Brown) | Connected to DAE 15 | Not connected | |
| 4_1/DAE 15 - BE 4 EA 1 (Brown) | Connected to DAE 14 | Connected to DAE 16 | |
| 4_0/DAE 14 - BE 4 EA 0 (Brown) | Connected to DPE 0 port 2 | Connected to DAE 15 | |
| 3_2/DAE 13 - BE 3 EA 2 (Green) | Connected to DAE 12 | Not connected | |
| 3_1/DAE 12 - BE 3 EA 1 (Green) | Connected to DAE 11 | Connected to DAE 13 | |
| 3_0/DAE 11 - BE 3 EA 0 (Green) | Connected to DPE 0 port 1 | Connected to DAE 12 | |
| 2_2/DAE 10 - BE 2 EA 2 (Black) | Connected to DAE 9 | Not connected | |
| 2_1/DAE 9 - BE 2 EA 1 (Black) | Connected to DAE 10 | Connected to DAE 8 | |
| 2_0/DAE 8 - BE 2 EA 0 (Black) | Connected to DPE 0 port 0 | Connected to DAE 9 | |
| 0_3/DAE 7 - BE 0 EA 3 (Orange) | Connected to DAE 6 | Not connected | |
| 0_2/DAE 6 - BE 0 EA 2 (Orange) | Connected to DAE 5 | Connected to DAE 7 | |
| 0_1/DAE 5 - BE 0 EA 1 (Orange) | Connected to DPE SAS 0 | Connected to DAE 6 | |
| 1_3/DAE 4 - BE 1 EA 3 (Blue) | Connected to DAE 3 | Not connected | |
| 1_2/DAE 3 - BE 1 EA 2 (Blue) | Connected to DAE 2 | Connected to DAE 4 | |
| 1_1/DAE 2 - BE 1 EA 2 (Blue) | Connected to DAE 1 | Connected to DAE 3 | |
| 1_0/DAE 1 - BE 1 EA 0 (Blue) | Connected to DPE SAS 1 | Connected to DAE 2 | |
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