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This section describes additional elements that can ordered by the user to maximize
enclosure capabilities.
Upgrading a Model 2100 Enclosure to a
Model 2200 Enclosure
A Model 2100 enclosure can be upgraded to a Model 2200 enclosure by installing
additional hardware. The required hardware includes:
array controller that supports six I/O module functionality
cache module (Model 2200 supported)
ECB
four I/O modules
Redundant Controller Set
Base configurations consist of one controller set. This configuration sufficiently conducts
all system operations. However, establishing a dual redundant system composed of two
controllers, two cache modules, and two ECBs provides the most effective and efficient
method of ensuring continuous system operation and eliminates any one element as a
single point of failure.
Power Monitoring Devices
Important electrical aspects for connecting a power monitoring device, such as an
uninterruptible power supply (UPS), are detailed in Appendix B. The serial port supports
power monitoring connection capabilities. Use of a UPS ensures that the temporary loss of
AC input power does not immediately shut down the system.
Table 1–2 identifies the power monitoring signals and their pinouts at the serial port.
Under normal operations, both AC_FAIL and TWO_MINUTE_WARNING are
deasserted. When AC_FAIL is asserted, this means that the UPS is running off its
batteries. When two minutes of UPS battery life remain, the EMU informs the controller
of the impending power loss. The controller must then complete operations and enter a
quiesced state prior to power loss.
Introducing the Controller Enclosure
1–7
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