Installation guide

Larger Configurations
Four more disk drive modules can be added to the base configuration in one loop. For
a balanced subsystem, however, it is recommended that the two groups of disk drive
modules be connected in two separate loops, each of which is connected to a separate
pair of connectors on the SSA attachment (see Figure 16).
No improvement in performance is gained if the disk drive modules are moved to other
slots and connected in more than two loops by way of an additional SSA attachment.
The cables are described in “SSA Cables” on page 38. The internal connections of
Model T40 are shown in Note 4b on page 10.
For information about the rules for SSA loops, see Note 4a on page 9.
1
2 2 2 2
7133 unit
4
5
8
9
1
16
12
13
4321
Using system
A1 A2 B1 B2
5678
Figure 16. Larger Configuration
Appendix A. Example Configurations 29