root partition on geli+gmirror

[OxY]

hi!

now, i'm in the last phase, the encrypted system is bootable, everything
is set, need to go!
booting fs is (/dev/mirror/plex0s1a)
but i can't boot... the system asks for password for the encrypted file 
system (/dev/mirror/plex0s2.elia) before mounting the root fs..
after it's done booting sequence prints the usual geli attach msg, then goes 
on..
and then..it hangs, mountroot:> line, need to type in the valid path for the 
root fs
however i did it before to the fstab..
/dev/mirror/plex0s2.elib             none            swap    sw 
0       0
/dev/mirror/plex0s2.elia             /               ufs     rw 
1       1

after i type in the:  ufs:mirror/plex0s2.elia  path then boot goes on, 
everythings fine,
system boots up!
did i do anything wrong, or theres something mess around geli+gmirror 
combo..
before the mirroring i tested geli alone, and it booted up well, without any 
problem..
may i attach any log, output, etc?

thanks for your help in advance!