The boot environment must have a status of “complete.”  

To check status, see Displaying the Status of All Boot Environments.

If the boot environment is not the current boot environment, you cannot have mounted the partitions of that boot environment by using the luumount or mount commands.

To view man pages, see lumount(1M) or mount(1M).

The boot environment that you want to activate cannot be involved in a comparison operation.  

For procedures, see Comparing Boot Environments.

If you want to reconfigure swap, make this change prior to booting the inactive boot environment. By default, all boot environments share the same swap devices.  

To reconfigure swap, see “To Create a New Boot Environment,” Step 9 or To Create a Boot Environment and Reconfiguring Swap (Command-Line Interface).