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Storage System Hardware Components
99Enterprise Virtual Array 3000 User Guide
Using the Enclosure Number Feature
This section provides a general description of the purpose, function, and operation
of the EMU enclosure number (En) feature.
En Description
In a single rack configuration, the En is a decimal number in the range 00 through
14, which is automatically assigned by the enclosure address bus.
By default, the two-character alphanumeric display shows this number. Pressing
the bottom pushbutton changes the display to En, the En display mode.
When the display is En, pressing and releasing the top pushbutton displays the En.
A display of 00 indicates that the enclosure is not connected to the enclosure
address bus. When this condition exists, there is no EMU-to-EMU communication
over the enclosure address bus.
A display of 01 through 14 indicates that the enclosure is physically connected to
the enclosure address bus and can exchange information with other enclosures on
the enclosure address bus. The decimal number indicates the physical position of
the enclosure in relation to the bottom of the rack.
■ 01 is the address of the enclosure connected to the bottom connector in the
first (bottom) junction box (JB).
■ 14 is the address of the enclosure closest to end of the bus, the top connector
in the last (upper) JB.
Note: The enclosure address bus connection determines the
En
. For a single rack, the
display is a decimal number in the range
01
through
14
.
You can only display, never change the
En
value.
Unless there is an error condition, the display automatically returns to the En
(01 through 14) one minute after a pushbutton was last pressed.
Enclosure Address Bus
The enclosure address bus is composed of cables and junctions boxes (JBs) that
interconnect the drive enclosures and controller enclosures to provide a means for
managing and reporting status and environmental conditions within the cabinet.
Each EMU collects data for its associated enclosure. The various address bus
components are shown in Figure 44.