HP Array Controller HSG V8.7 Software - Manual (Page 132)

Power Distribution
6–6 UltraSCSI RAID Enclosure
AC Power Buses
AC power distribution to the UltraSCSI shelf power supplies is
distributed over two power buses—bus A and bus B (see Figure 6–4).
Each power bus has an ac power source, a separate ac input box,
power supplies, and power cords.
Figure 6–4 Enclosure AC Power Buses
Although the standard (n+1) power configuration can operate the
subsystem via power bus A (C
ALLOUT 1), Compaq recommends
using both power buses with two ac power sources—the optimum
power configuration (n+4).
Power bus A (C ALLOUT 1) uses black power cords and power bus B
(C ALLOUT 2) uses grey power cords. These colored cords indicate the
power bus being used:
• AC input box A controls power bus A—power supply positions
1A through 5A (n+1 configuration in Figure 6–4)
• AC input box B controls power bus B— power supply positions
1B through 4B (n+4 configuration in Figure 6–4)
n+1 Configuration n+4 Configurations Figure C ALLOUTS
1. Power bus A
2. Power bus B
17
11
CXO6301B
19 20 21 22 23 24
13 14 15 16 18
7 8 9 10 12
1 2 3 4 5 6
A
4A
3A
2A
1A
5A Shelf 4
Shelf 3
Shelf 2
Shelf 1
1
17
11
CXO6482B
19 20 21 22 23 24
13 14 15 16 18
7 8 9 10 12
1 2 3 4 5 6
Controller A
Controller B
EMU PVA
Cache B Cache A
A B
4A
3A
2A
1A
3B
2B
1B
4B Shelf 4
Shelf 3
Shelf 2
Shelf 1
1 2