If you have an existing ZFS root pool or UFS boot environment that is not currently used as the active boot environment, you can use the following example to create a new ZFS boot environment from this boot environment. After the new ZFS boot environment is created, this new boot environment can be upgraded and activated at your convenience.
If you are creating a boot environment from a source other than the currently running system, you must use the lucreate command with the -s option. The -s option works the same as for a UFS file system. The -s option provides the path to the alternate root (/) file system. This alternate root (/) file system is the source for the creation of the new ZFS root pool. The alternate root can be either a UFS (/) root file system or a ZFS root pool. The copy process might take time, depending on your system.
The following example shows how the -s option is used when creating a boot environment on another ZFS root pool.
The following command creates a new ZFS root pool from an existing ZFS root pool. The -n option assigns the name to the boot environment to be created, new-zfsBE. The -s option specifies the boot environment, rpool3, to be used as the source of the copy instead of the currently running boot environment. The -p option specifies to place the new boot environment in rpool2.
# lucreate -n new-zfsBE -s rpool3 -p rpool2 # lustatus boot environment Is Active Active Can Copy Name Complete Now OnReboot Delete Status ------------------------------------------------------------------------ zfsBE yes yes yes no - zfsBE2 yes no no yes - zfsBE3 yes no no yes - new-zfsBE yes no no yes - # zfs list NAME USED AVAIL REFER MOUNTPOINT rpool2 9.29G 57.6G 20K /rpool2 rpool2/ROOT/ 5.38G 57.6G 18K /rpool2/ROOT rpool2/ROOT/new-zfsBE 5.38G 57.6G 551M /tmp/.new.luupdall.109859 rpool2/dump 3.99G - 3.99G - rpool2/swap 3.99G - 3.99G - rpool3 9.29G 57.6G 20K /rpool2 rpool3/ROOT/ 5.38G 57.6G 18K /rpool2/ROOT rpool3/ROOT/zfsBE3 5.38G 57.6G 551M /tmp/.new.luupdall.109859 rpool3/dump 3.99G - 3.99G - rpool3/swap 3.99G - 3.99G - prool 9.29G 57.6G 20K /.new.lulib.rs.109262 rpool/ROOT 5.46G 57.6G 18K legacy rpool/ROOT/zfsBE 5.46G 57.6G 551M rpool/dump 3.99G - 3.99G - rpool/swap 3.99G - 3.99G -
You can now upgrade and activate the new boot environment.