[IBM DS] What is single-Rank Extent Pool configuration in DS8K Configuration?

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In a single-Rank Extent Pool configuration:
- The number of Extent Pools is equal to the number of Ranks.
- The relationship between logical volume and Rank is simpler to manage since there is a one-to-one relationship between Extent Pool and Rank.
- Logical volume size is limited to the capacity of a single Rank.

See below example:

 

  Array Site DA Pair   Array Rank Extent Pool Drive Size & Speed Storage Type RAID Type Array Format Total Extents
   
1 S1 2 S A0 R0 P00 73G15K FB 5 6+P+S 388
2 S2 2 S A1 R1 P01 73G15K FB 5 6+P+S 388
3 S3 2 S A2 R2 P02 73G15K FB 5 6+P+S 388
4 S4 2 S A3 R3 P03 73G15K FB 5 6+P+S 388
5 S5 2   A4 R4 P04 73G15K FB 5 7+P 450
6 S6 2   A5 R5 P05 73G15K FB 5 7+P 450
7 S7 2   A6 R6 P06 73G15K FB 5 7+P 450
8 S8 2   A7 R7 P07 73G15K FB 5 7+P 450
9 S9 0 S A8 R8 P08 73G15K FB 5 6+P+S 388
10 S10 0 S A9 R9 P09 73G15K FB 5 6+P+S 388
11 S11 0 S A10 R10 P10 73G15K FB 5 6+P+S 388
12 S12 0 S A11 R11 P11 73G15K FB 5 6+P+S 388
13 S13 0   A12 R12 P12 73G15K FB 5 7+P 450
14 S14 0   A13 R13 P13 73G15K FB 5 7+P 450
15 S15 0   A14 R14 P14 73G15K FB 5 7+P 450
16 S16 0   A15 R15 P15 73G15K FB 5 7+P 450
17 S17 3 S A16 R16 P16 73G15K FB 5 6+P+S 388
18 S18 3 S A17 R17 P17 73G15K FB 5 6+P+S 388
19 S19 3 S A18 R18 P18 73G15K FB 5 6+P+S 388
20 S20 3 S A19 R19 P19 73G15K FB 5 6+P+S 388
21 S21 3   A20 R20 P20 73G15K FB 5 7+P 450
22 S22 3   A21 R21 P21 73G15K FB 5 7+P 450
23 S23 3   A22 R22 P22 73G15K FB 5 7+P 450
24 S24 3   A23 R23 P23 73G15K FB 5 7+P 450
25 S25 1 S A24 R24 P24 73G15K FB 5 6+P+S 388
26 S26 1 S A25 R25 P25 73G15K FB 5 6+P+S 388
27 S27 1 S A26 R26 P26 73G15K FB 5 6+P+S 388
28 S28 1 S A27 R27 P27 73G15K FB 5 6+P+S 388
29 S29 1   A28 R28 P28 73G15K FB 5 7+P 450
30 S30 1   A29 R29 P29 73G15K FB 5 7+P 450
31 S31 1   A30 R30 P30 73G15K FB 5 7+P 450
32 S32 1   A31 R31 P31 73G15K FB 5 7+P 450

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