You disable a component by setting its component_state property to Disabled. This adds the component to the ASR blacklist.
-> set /SYS/MB/CMP0/BOB1/CH0/D0 component_state=Disabled
-> stop /SYS Are you sure you want to stop /SYS (y/n)? y Stopping /SYS -> start /SYS Are you sure you want to start /SYS (y/n)? y Starting /SYS
Note - In the Oracle ILOM shell there is no notification when the system is actually powered off. Powering off takes about a minute. Use the show /HOST command to determine if the host has powered off.