12
Components
Controller enclosure—rear panel layout
The diagram and table below display and identify important component items comprising the rear panel layout of the
MSA 2050 controller enclosure (MSA 2050 SAN is shown in the example).
Figure 4 MSA 2050 Array: rear panel
A controller enclosure accommodates two power supply FRUs of the same type—either both AC or both DC—within the
two power supply slots (see two instances of callout 1 above). The controller enclosure accommodates two controller
module FRUs of the same type within the I/O module slots (see callouts 2 and 3 above).
IMPORTANT:
MSA 2050 controller enclosures support dual-controller configuration only. A controller module must be
installed in each IOM slot to ensure sufficient airflow through the enclosure during operation.
The diagrams with tables that immediately follow provide descriptions of the different controller modules and power
supply modules that can be installed into the rear panel of an MSA 2050 controller enclosure. Showing controller
modules and power supply modules separately from the enclosure provides improved clarity in identifying the
component items called out in the diagrams and described in the tables. Descriptions are also provided for optional drive
enclosures supported by MSA 2050 controller enclosures for expanding storage capacity.
NOTE:
MSA 2050 controller enclosures support hot-plug replacement of redundant controller modules, fans, power
supplies, disk drives, and I/O modules. Hot-add of drive enclosures is also supported.
1
AC Power supplies
2
Controller module A (see face plate detail figures)
3
Controller module B (see face plate detail figures)
4
DC Power supply (2) — (DC model only)
5
DC Power switch
1
1
5
4
2
3
MSA 2050 controller enclosure
(rear panel locator illustration)