Encrypting mirrored device with geli fails

[Thomas Hobbes]

>
> > I was trying to encrypt /dev/mirror/gm0s1f but a "MD5 mismatch"
> occurred:
>
> # umount /crypt
> > # dd if=/dev/random of=/root/gm0s1f.key bs=64 count=1
> > 1+0 records in
> > 1+0 records out
> > 64 bytes transferred in 0.000580 secs (110331 bytes/sec)
>
> longer.. 32k or so.


The same failure occurred.