[zfs-code] Break a ZFS mirror and concatenate the disks

[Kory Wheatley]

We have a ZFS mirror setup of two 73GB's disk, but we are running out of space. 
 I want to break the mirror and join the disk to have a pool of 146GB, and of 
course not lose the data doing this.  What are the commands?
To break the mirror I would do
 
zpool detach moodle c1t3d0
 
       NAME        STATE     READ WRITE CKSUM
        moodle      ONLINE       0     0     0
          mirror    ONLINE       0     0     0
            c1t2d0  ONLINE       0     0     0
            c1t3d0  ONLINE       0     0     0

Then could I do 
zpool add moodle c1t3d0

without losing the data?
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