gmirror on slice

[Wojciech Puchar]

>>> gmirror: Can't store metadata on /dev/ad4s1: Operation not permitted.
>>> ha-db1# sysctl kern.geom.debugflags=16
>
>> you try to make a mirror on used slice or some partition of that
>
> and what's wrong with that, actually?
> how do I create gmirror-ed slice then?
>
> I have also tried the above commands on system that has ad4s1 and its
> partitions unmounted, still getting the same error.
swap off?