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About interleaved DAE cabling conventions

The interleaved 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 intertwined. So, the 1st DAE is daisy-chained to the 7th DAE designated as BE1 EA1, and so on.

The 2nd DAE connects to DPE SAS port 0 to extend back-end bus 0 as enclosure 1 (BE0 EA1) and is daisy-chained to the 8th DAE, designated as BE0 EA2, and so on.

The 3rd 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 4th 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 10th DAE, designated as BE3 EA1, and so on.

The 5th 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 11th DAE, designated as BE4 EA1, and so on.

Finally, the 6th 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 12th DAE, designated as BE5 EA1, and so on.

19 2U DAEs in a interleaved configuration across 6 back-end buses

Example:	DAE number and address	DAE port connections
		Port A (Input)	Port B (Output)
	1_3/DAE 19 - BE 1 EA 3 (Blue)	Connected to DAE 13	Not connected
	5_2/DAE 18 - BE 5 EA 2 (Cyan)	Connected to DAE 12	Not connected
	4_2/DAE 17 - BE 4 EA 2 (Brown)	Connected to DAE 11	Not connected
	3_2/DAE 16 - BE 3 EA 2 (Green)	Connected to DAE 10	Not connected
	2_2/DAE 15 - BE 2 EA 2 (Black)	Connected to DAE 9	Not connected
	0_3/DAE 14 - BE 0 EA 3 (Orange)	Connected to DAE 8	Not connected
	1_2/DAE 13 - BE 1 EA 2 (Blue)	Connected to DAE 7	Connected to DAE 19
	5_1/DAE 12 - BE 5 EA 1 (Cyan)	Connected to DAE 6	Connected to DAE 18
	4_1/DAE 11 - BE 4 EA 1 (Brown)	Connected to DAE 5	Connected to DAE 17
	3_1/DAE 10 - BE 3 EA 1 (Green)	Connected to DAE 4	Connected to DAE 16
	2_1/DAE 9 - BE 2 EA 1 (Black)	Connected to DAE 3	Connected to DAE 15
	0_2/DAE 8 - BE 0 EA 2 (Orange)	Connected to DAE 2	Connected to DAE 14
	1_1/DAE 7 - BE 1 EA 1 (Blue)	Connected to DAE 1	Connected to DAE 13
	5_0/DAE 6 - BE 5 EA 0 (Cyan)	Connected to DPE 0 port 3	Connected to DAE 12
	4_0/DAE 5 - BE 4 EA 0 (Brown)	Connected to DPE 0 port 2	Connected to DAE 11
	3_0/DAE 4 - BE 3 EA 0 (Green)	Connected to DPE 0 port 1	Connected to DAE 10
	2_0/DAE 3 - BE 2 EA 0 (Black)	Connected to DPE 0 port 0	Connected to DAE 9
	0_1/DAE 2 - BE 0 EA 1 (Orange)	Connected to DPE SAS 0	Connected to DAE 8
	1_0/DAE 1 - BE 1 EA 0 (Blue)	Connected to DPE SAS 1	Connected to DAE 2