Users Guide

• 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.