Compaq 9900 - Manual (Page 27)

Hitachi Lightning 9900™ User and Reference Guide 13
Minimum configuration of 9960 subsystem
Disk Array Unit Disk Array Unit Disk Array Unit 9900 Controller Disk Array Unit Disk Array Unit Disk Array Unit
Figure 2.2 9960 Subsystem Frames
Figure 2.3 9910 Subsystem Frame