Owner's Manual

58 Installing and Setting Up CMC
CMC Failsafe Mode
In the failsafe mode, similar to the failover protection offered by the
redundant CMC, 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.