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Multiple-Unit Configurations
An SSA subsystem can include disk drive modules that are installed in more than one
7133. You can connect up to 48 disk drive modules in one loop, and up to 96 disk drive
modules to one SSA attachment.
In larger subsystems, unless the work load of the system has special requirements,
best performance is obtained if you connect equal numbers of disk drive modules to the
loops that are available. In the following example, 32 disk drive modules are connected
to an SSA attachment. They can all be connected in one loop, but for better
performance and better serviceability, it is recommended that the disk drive modules be
connected in two loops, each of which is connected to a separate pair of connectors on
the SSA attachment (see Figure 30).
Using system
A1 A2
1
2
2 2
7133 unit 1
4
8
7
6
5
5
8
9 10 11 12
9
7133 unit 2
4
8
7
6
5
5
8
9 10 11 12
9
Figure 30. Multiple-Unit Configuration (Two 7133s)
B1 B2
2
1
4 3 2 1
16
13
13 14 15 16
12
1
4 3 2 1
16
13
13 14 15 16
12
Chapter 1. Reference Information
51
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