Users Guide

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.

Active CMC Election Process

There is no difference between the two CMC slots; that is, slot does not dictate precedence. Instead, CMC that is installed or

booted first assumes the role of the active CMC. If AC power is applied with two CMCs installed, CMC installed in CMC chassis slot

1 (the left) normally assumes the active role. The active CMC is indicated by the blue LED.

If two CMCs are inserted into a chassis that is already powered on, automatic active/standby negotiation can take up to two

minutes. Normal chassis operation resumes when the negotiation is complete.

Obtaining Health Status of Redundant CMC

You can view the health status of the standby CMC in the Web interface. For more information about accessing CMC health status

in the Web interface, see Viewing Chassis Information and Monitoring Chassis and Component Health.