Outage Impact of a Cisco UCS Manager Firmware Upgrade A firmware upgrade to Cisco UCS Manager causes the following disruptions: 1. Cisco UCS Manager GUI-All users logged in to Cisco UCS Manager GUI are logged out and their sessions ended. 2. Any unsaved work in progress is lost. 3. Cisco UCS Manager CLI-All users logged in through telnet are logged out and their sessions ended. Reference: https://www.cisco.com/c/en/us/td/docs/unified_computing/ucs/sw/firmware-mgmt/gui/3- 0/b_GUI_Firmware_Management_30/b_GUI_Firmware_Management_30_chapter_0111.html