Weird fdisk behavior

Philip Murray pmurray at
Mon Jun 20 00:01:39 GMT 2005


On 18/06/2005, at 1:28 PM, Baldur Gislason wrote:
> I am trying to add another partition to my root drive, it has a few  
> gigabytes of unpartitioned space.
> Whenever I try to run fdisk -u it says cannot open disk /dev/ad0:  
> No such file or directory
> ad0 does exist, why does fdisk say otherwise? fdisk can display the  
> partition table but it can't alter it.
> securelevel is -1 and this is FreeBSD 5.4-STABLE from the beginning  
> of May this year.

Try setting

sysctl kern.geom.debugflags=16

before running fdisk. This stops GEOM protecting the drive/partition  
and allows fdisk to open it. I think fdisk and bsdlabel have been  
taught about GEOM in 6-current, but I very might well be wrong.

Phil Murray

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