APC SGI 15000 RAID - Manual (Page 147)

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Figure B–4 Controller-Drive Enclosure Couplet (2x Configuration)
P S P S
A
B
C
D
E
F
G
H
P
S
E E F
A B A
C D
G H G
B
D
H
F
C
A
B
C
D
E
F
G
H
P
S
Controller #1
Controller #2
Channel A/B
Channel C/D
Channel E/F
Channel G/H
Channel P/S