DMX-3 communications and environmental control
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Symmetrix DMX-3 Hardware
DMX-3 communications and environmental control
Within the Symmetrix DMX-3 message matrix are the Environmental
Control Module (ECM) and Communication Control Module (CCM).
These two modules provide the low-level, system-wide
communications for running application software, monitoring, and
system diagnostics from the service processor.
Communications
control functions
The XCM’s primary function is to act as a communications agent
between the service processor (KVM and server) and the embedded
processing nodes within the system. Figure 15 on page 90 illustrates
the Ethernet fabric interconnecting the processing nodes to the
service processor. External connections to the service processor
provide dial-home capabilities for remote monitoring and
diagnostics.
The software-driven failover mechanism exists such that the Ethernet
fabric remains intact should an XCM become temporarily
unavailable. As a backup to the Ethernet fabric, the XCM also
contains RS-232 multiplexing logic to allow for an alternate means of
serial communication to embedded processing nodes within the
DMX-3. The XCM also has the ability to issue remote commands to
the director boards, global memory directors, and itself. These
commands can be issued from the service processor or remotely, by
the EMC Customer Support Center, providing a rich set of intelligent
serviceability functions. Also within the XCM is the top-level fabric
for the message matrix communications system. This is a high-speed
communications fabric within the DMX-3 that allows for fast, reliable
messaging between compute nodes.
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