Is ZFS Multi-vdev root pool configuration discovery supported?

[Martin Simmons]

Hi,

Does anyone know if FreeBSD 9.2 (or indeed head) supports "Root On ZFS" with a
multi-vdev pool (e.g. 4 disks configured as two mirrored pairs)?

Looking at the source, sys/cddl/contrib/opensolaris/uts/common/fs/zfs/spa.c
contains the comment:

/*
 * Multi-vdev root pool configuration discovery is not supported yet.
 */

but the code below it from r243502 suggests that this is no longer true.

__Martin