Hello,
I hope all is well.
ILO and OA are online no outage.
VC up-gradation no outage if it is active standby. ( You have to check how the VC configure “ Active-Active or Active-standby”) before updating.
Outage if it is active-active.
However, we always suggest you plan VC upgradation during a planned maintenance window to avoid any outages on the blades
NOTE: You have to update the firmware as an incremental update ( skip two versions) If the OA & VC running very old firmware.
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Regards,