The Boot Environment screen has options that monitor and manage the ZFS boot pool and devices that store the TrueNAS operating system.
TrueNAS supports a ZFS feature known as boot environments. These are snapshot clones of the TrueNAS boot-pool install location that TrueNAS boots into. Only one boot environment is used for booting at a time.
The Boot Environment screen lists boot environments created by updates performed on the system. It has options for monitoring and maintaining the TrueNAS install pool and disks, and includes managing OS restore points(called boot environments) for the TrueNAS system.
Boot environments do not share all configuration information. Updates create a new environment and carry forward core configuration, but other state changes do not propagate across environments. Switching between environments frequently creates configuration divergence and splits audit logs between environments.
Screen options shown at the top right of the screen are:
