Someone

root@reef: gmirror insert gm0 /dev/da1                     /~ [15:00]
Not all disks connected.
root@reef: gmirror clear /dev/da1                          /~ [15:01]
root@reef: gmirror insert gm0 /dev/da1                     /~ [15:06]
Not all disks connected.
root@reef: gmirror clear /dev/da1                          /~ [15:06]
Can't clear metadata on /dev/da1: Invalid argument.
Not fully done.
root@reef: gmirror insert gm0 /dev/da1                     /~ [15:07]
Not all disks connected.

root@reef: gmirror status                                  /~ [15:07]
      Name    Status  Components
mirror/gm0  DEGRADED  da0