gmirror on FreeBSD

gmirror label -v -b split -s 2048 data ad4 ad8

gmirror load

newfs /dev/mirror/data
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Insert in /etc/fstab

/dev/mirror/data       /data       ufs            rw            2             2

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on next boot, go into single user mode and transform /data to use softupdates.

My mirror got disturbed by Windows writing something on one drive.

gmirror remove  ad4

gmirror rebuild

after gmirror status says 100%, then reboot for a pristine restore.