IBM 084, Инструкция по установке и эксплуатации

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Figure 14. 6Gb/s SAS EBOD module
The system can operate with one or two modules. If the enclosure is run with a single module, the other
I/O module bay must be filled with a blank module. The presence of I/O modules is checked when the
power is switched on. The enclosure will not power up if there are no I/O modules present. An alarm
occurs when incompatible configurations are detected.
The enclosure chassis is keyed to prevent I/O modules from being inserted upside down.
Enclosure management
SBB I/O modules actively manage the enclosure. If one of the modules fails in a two module system, the
other module will continue to operate.
Chapter 2. System overview 17