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When you configure Set Startup Version Only for an I/O module, the I/O module is rebooted when the
fabric interconnect in its data path is rebooted. If you do not configure Set Startup Version Only for an
I/O module, the I/O module reboots and disrupts traffic. In addition, if Cisco UCS Manager detects a
protocol and firmware version mismatch between the fabric interconnect and the I/O module, Cisco UCS
Manager automatically updates the I/O module with the firmware version that matches the firmware in
the fabric interconnect and then activates the firmware and reboots the I/O module again.
Caution
Outage Impacts of Direct Firmware Upgrades
When you perform a direct firmware upgrade on an endpoint, you can disrupt traffic or cause an outage in
one or more of the endpoints in the Cisco UCS domain.
Outage Impact of a Fabric Interconnect Firmware Upgrade
When you upgrade the firmware for a fabric interconnect, you cause the following outage impacts and
disruptions:
• The fabric interconnect reboots.
• The corresponding I/O modules reboot.
Outage Impact of a Cisco UCS Manager Firmware Upgrade
A firmware upgrade to Cisco UCS Manager causes the following disruptions:
• Cisco UCS Manager GUI—All users logged in to Cisco UCS Manager GUI are logged out and their
sessions ended.
Any unsaved work in progress is lost.
• Cisco UCS Manager CLI—All users logged in through telnet are logged out and their sessions ended.
Outage Impact of an I/O Module Firmware Upgrade
When you upgrade the firmware for an I/O module, you cause the following outage impacts and disruptions:
• For a standalone configuration with a single fabric interconnect, data traffic is disrupted when the I/O
module reboots. For a cluster configuration with two fabric interconnects, data traffic fails over to the
other I/O module and the fabric interconnect in its data path.
• If you activate the new firmware as the startup version only, the I/O module reboots when the
corresponding fabric interconnect is rebooted.
• If you activate the new firmware as therunning and startup version, the I/O module reboots immediately.
• An I/O module can take up to ten minutes to become available after a firmware upgrade.
Outage Impact of a CIMC Firmware Upgrade
When you upgrade the firmware for a CIMC in a server, you impact only the CIMC and internal processes.
You do not interrupt server traffic. This firmware upgrade causes the following outage impacts and disruptions
to the CIMC:
Cisco UCS Manager GUI Configuration Guide, Release 2.0
196 OL-25712-04
Firmware Upgrades