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Dell Chassis Management Controller Version 6.0 for PowerEdge M1000e User’s Guide

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CMC Failsafe Mode

The M1000e enclosure enables the fail-safe mode to protect the blades and I/O modules from failures. The fail-safe mode is enabled when no CMC is in control of the chassis. During the CMC failover period or during a single CMC management loss:
  • You cannot turn on newly installed blades.
  • You cannot access existing blades remotely.
  • Chassis cooling fans run at 100% for thermal protection of the components.
  • Blade performance reduces to limit power consumption until management of the CMC is restored.
The following are some of the conditions that can result in CMC management loss:
  • CMC removal — Chassis management resumes after replacing CMC, or after failover to standby CMC.
  • CMC network cable removal or network connection loss — Chassis management resumes after the chassis fails over to the standby CMC. Network failover is only enabled in redundant CMC mode.
  • CMC reset — Chassis management resumes after CMC reboots or chassis fails over to the standby CMC.
  • CMC failover command issued — Chassis management resumes after the chassis fails over to the standby CMC.
  • CMC firmware update — Chassis management resumes after CMC reboots or chassis fails over to the standby CMC. It is recommended that you update the standby CMC first so that there is only one failover event.
  • CMC error detection and correction — Chassis management resumes after CMC resets or chassis fails over to the standby CMC.
NOTE You can configure the enclosure either with a single CMC or with redundant CMCs. In redundant CMC configurations, if the primary CMC loses communication with the enclosure or the management network, the standby CMC takes over chassis management.

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