Chapter 4: Drive Connection 79
One CE7922
Controller Tray or
CE7900 Controller
Tray and 17 to 28
FC4600 Drive Trays
You can add drive trays in series to each redundant pair of drive ports up to 28 drive
trays. In a configuration with 28 drive traydrive trays, four of the port pairs will have
four drive trays each, while the other four will have three drive trays each. The
following figure shows this arrangement schematically. The physical arrangement of
the drive trays in cabinets will depend on your particular installation.
The following table shows an example cabling pattern for adding three drive trays
(drive trays 9, 17, and 25) in series with drive tray 1. Add drive trays in series to each
redundant pair of drive ports so that the number of drive trays for each pair of drive
ports remains balanced, to the extent possible. For example, do not add a third drive
tray in series with drive tray 1 on ports 8 and 1 if another pair of drive ports has only
one drive tray connected.
Table 9 One CE7922 Controller Tray or CE7900 Controller Tray and Ten Drive
Trays
Cable
Controller A Controller B
Channel Number Channel Number Drive Trays
Ch1 Ch2 Ch3 Ch4 Ch5 Ch6 Ch7 Ch8 1 9 17 25
Port Number Port Number ESMs (Left or Right)
8 7 6 5 4 3 2 1 1 2 3 4 5 6 7 8 L R L R L R L R
1X B
2X B
17 A B
18 B A
33 A B
34 B A
49 AB
50 BA
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