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From: Ivan Voras <ivoras@freebsd.org>
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Subject: Re: strange geom interaction on 8.0?
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John Hay wrote:
> Hi,
> 
> On our Avila (arm) boxes we use a compact flash with 2 FreeBSD partitions
> made with fdisk. When we upgrade, we prepare the non active partition,
> change the active bit and reboot into the new partition. This worked well
> on FreeBSD 7.2-stable. But on 8.0 it does not want to work. I get
> something like this:
> 
> #############################
> agter:~ # fdisk -s ad0
> /dev/ad0: 1966 cyl 16 hd 63 sec
> Part        Start        Size Type Flags
>    1:          63      989793 0xa5 0x80
>    2:      990864      990864 0xa5 0x00
> agter:~ # echo "a 2" | fdisk -f - ad0
> ******* Working on device /dev/ad0 *******
> fdisk: Class not found
> agter:~ # fdisk -s ad0
> /dev/ad0: 1966 cyl 16 hd 63 sec
> Part        Start        Size Type Flags
>    1:          63      989793 0xa5 0x00
>    2:      990864      990864 0xa5 0x80
> agter:~ # reboot
> /sbin/reboot: Device not configured.
> agter:~ #
> #############################
> 
> Basically it looks like non of the commands that has not been executed
> want to execute. Just changing the active bit back does not help.
> 
> Can it be some interaction of the geom modules that are now standard
> in 8.0?
> 
> "kldstat -v | grep g_part" show these two:
>                 74 g_part_mbr
>                 73 g_part_bsd

Basically, fdisk and disklabel should not be used on 8.x anymore, try 
using gpart instead.