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Dell Chassis Management Controller Version 6.20 for PowerEdge M1000e User’s Guide

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Understanding Redundant CMC Environment

You can install a standby CMC that takes over if your active CMC fails. The redundant CMC may be pre-installed or can be installed later. It is important that CMC network is properly cabled to ensure full redundancy or best performance.
Failovers can occur when you:
  • Run the RACADM cmcchangeover command. (See the cmcchangeover command section in the Chassis Management Controller for Dell PowerEdge M1000e RACADM Command Line Reference Guide) .
  • Run the RACADM racreset command on the active CMC. (See the racreset command section in the Chassis Management Controller for Dell PowerEdge M1000e RACADM Command Line Reference Guide) .
  • Reset the active CMC from Web interface. (See the Reset CMC option for Power Control Operations that is described in Executing Power Control Operations .)
  • Remove the network cable from the active CMC.
  • Remove the active CMC from the chassis.
  • Initiate a CMC firmware flash on the active CMC.
  • Have an active CMC that is no longer functional.
  • NOTE: In the event of a CMC failover, all iDRAC connections and all active CMC sessions are lost. Users with lost sessions must reconnect to the new active CMC.

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