On Fri, 14 Sep 2012, Yuri wrote:

On 09/14/2012 19:23, Warren Block wrote:
Did you actually try gpart? GEOM prevents writes to providers that are in use, but gpart should handle it correctly if the problem is just that fdisk doesn't understand GEOM.

# gpart set -a active -i 1 ada0

If that fails, the provider is in use, usually mounted. The safety can be disabled, but it's better to figure out what has it in use.

Yes it is the hard drive with mounted /. But changing the active slice should be safe in any case.
gpart worked.
This safety feature is protecting people from themselves. Sounds very familiar.

gpart allowed it, so it's not the safety feature but merely that fdisk is aging and can't deal well with GEOM.
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