• IP address blocking• Number of login attempts allowed• Timespan for the lockout failure counts to occur• Lockout penalty time• To enable user blocking feature, use:racadm config -g cfgRacTuning -o cfgRacTuneUserBlkEnable <0|1>• To enable IP blocking feature, use:racadm config –g cfgRacTuning –o cfgRacTuneIPBlkEnable <0|1>• To specify the number of login attempts, use:racadm config –g cfgRacTuning –o cfgRacTuneIpBlkFailCount• To specify the time span within which, lockout fail count failures must occur, use:racadm config –g cfgRacTuning –o cfgRacTuneIpBlkFailWindow• To specify value for lockout penalty time, use:racadm config –g cfgRacTuning –o cfgRacTuneIpBlkPenaltyTimeFor more information about these objects, see the Chassis Management Controller for PowerEdge VRTX RACADM Command LineReference Guide available at dell.com/support/manuals.Understanding Redundant CMC EnvironmentYou can install a standby CMC that takes over if your active CMC stops functioning. The redundant CMC may be pre-installed orcan be installed later. To make sure full redundancy or best performance, it is important that the CMC network is properly cabled.Failovers can occur when you:• Run the RACADM cmcchangeover command. See the cmcchangeover command section in the Chassis ManagementController for PowerEdge VRTX RACADM Command Line Reference Guide available at dell.com/support/manuals.• Run the RACADM racreset command on the active CMC. See the racreset command section in the Chassis ManagementController for PowerEdge VRTX RACADM Command Line Reference Guide available at dell.com/support/manuals..• Reset the active CMC from web interface. See the Reset CMC option for Power Control Operations that is described inExecuting 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 logged off. Users withlogged-off sessions must reconnect to the new active CMC.About Standby CMCThe standby CMC is identical to and is maintained as a mirror of the active CMC. The active and standby CMCs must both beinstalled with the same firmware revision. If the firmware revisions differ, the system reports as “redundancy degraded”.The standby CMC assumes the same settings and properties of the active CMC. You must maintain the same firmware version onboth the CMCs, but you do not have to duplicate configuration settings on the standby CMC.NOTE: For information about installing a CMC, see theVRTX Owner’s Manual. For instructions about installing CMCfirmware on your standby CMC, see Updating Firmware.CMC Failsafe ModeThe PowerEdge VRTX enclosure enables the fail-safe mode to protect the servers and I/O module from not functioning. The fail-safe mode is enabled when a CMC is not in control of the chassis. During the CMC failover period, or during a single CMCmanagement loss:36
