Specifications

2–2 Controller and Host Concepts
Terminology
When configuring the subsystem you will encounter the following terms and concepts
that you must understand:
■ Controller A and controller B
■ This controller and other controller
■ Unresponsive and surviving controller
Controller A and Controller B
Controllers and cache modules are designated either A or B depending on their
location within the storage enclosure as shown in.
Figure 2–1. Controller A and Controller B Locations
This Controller and Other Controller
Some CLI commands use the terms “this” and “other” to identify one controller or the
other in a dual-redundant pair. These designations are defined as follows:
■ This controller—the controller that you are currently connected, regardless of
whether it is controller A or controller B. It is the controller through which the
CLI commands are being entered. The maintenance terminal is connected to the
maintenance port of “this” controller.
Controller A
Controller B
Cache module A Cache module B
EMU
PVA
CXO6283A