Dell PowerEdge VRTX Enclosure Owner's Manual

The VRTX enclosure enables the fail-safe mode to protect the server modules and the I/O module 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:

• server modules cannot be accessed remotely
• you cannot turn on a server module(s)
• the cooling fans continue to operate at the same speed

The following are some of the conditions that can result in CMC management loss:

Condition

Description

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 the 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 the 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. For more information about updating the CMC firmware, see the Dell Chassis Management Controller for Dell PowerEdge VRTX User’s Guide at Dell.com/esmmanuals.

CMC error detection and correction

Chassis management resumes after the CMC resets or chassis fails over to the standby CMC.