gpart, modified label does not show up in /dev/gpt.

[Johan Hendriks]

Peter schreef:
>> Peter schreef:
>>>> Hello all.
>>>>
>>>> I just installed FreeBSD 9.0 RC2 and upgraded to 9.0 RC3.
>>>>
>>>> I used the standard GPT disk layout at install.
>>>>
>>>> Now i want to set labels for my disk, so that i can swap around disks a
>>>> little more easy.
>>>> So reading through the man page it told me to use gpart modify -i -l
>>>>
>>>> The layout is as follows:
>>>> test# gpart status
>>>>     Name  Status  Components
>>>> da0p1      OK  da0
>>>> da0p2      OK  da0
>>>> da0p3      OK  da0
>>>>
>>>> test# gpart list | grep label
>>>>       label: (null)
>>>>       label: (null)
>>>>       label: (null)
>>>>
>>>> Now i modified the gpart labels.
>>>>
>>>> test# gpart modify -i1 -l bootpart da0
>>>> da0p1 modified
>>>> test# gpart modify -i2 -l rootpart da0
>>>> da0p2 modified
>>>> test# gpart modify -i3 -l swap da0
>>>> da0p3 modified
>>>>
>>>> Ok all looks fine.
>>>> Now lets see if i can use my labels
>>>>
>>>> test# cd /dev/gpt
>>>> /dev/gpt: No such file or directory.
>>>>
>>>> Well it does not create my labels
>>>> I did check if the labels where there
>>>>
>>>> test# gpart list | grep label
>>>>       label: bootpart
>>>>       label: rootpart
>>>>       label: swap
>>>>
>>>> So i rebooted the machine!
>>>> But after a reboot, still no /dev/gpt.
>>>>
>>>> So why is it not creating my labels!
>>>> Am i missing a step?
>>>>
>>>> Thanks for your time.
>>>>
>>>> And before i forget, merry christmas to all, and a wonderful 2012.
>>>>
>>>> regards,
>>>> Johan Hendriks
>>>>
>>> I was going to say if you mount /dev/da0p? its /dev/gpt/label
>>> disappears,
>>> and since all the partition are mounted already [/dev/gpt/ is empty],
>>> then
>>> /dev/gpt is maybe also removed.......but /dev/gpt/bootpart is not
>>> mounted
>>> and should still show up.
>>>
>>>
>>> When you ran the 'gpart' commands, did you set the sysctl geom debug
>>> variable? [sysctl kern.geom.debugflags=17]
>>> After the reboot, are the labels still there? [gpart list | grep label]
>>>
>>> ]Peter[
>>>
>> I placed some other disk in (for the zfs pool)
>> Now i have /dev/gpt/bootpart, but not the labels for swap and /
>> I did not use the sysctl value.
>>
>> And yes the labels are stil in place.
>>
>> test# cd /dev/gpt
>> test# ls -al
>> total 1
>> dr-xr-xr-x   2 root  wheel          512 Dec 23 20:02 .
>> dr-xr-xr-x  10 root  wheel          512 Dec 23 21:02 ..
>> crw-r-----   1 root  operator    0, 123 Dec 23 20:02 bootpart
>> test# gpart list | grep label
>>      label: bootpart
>>      label: rootpart
>>      label: swap
>> test#
>>
>> I will try the debugflag option.
>> But it should not be nessacary i guess.
>>
>> thanks
>> regards
>> Johan
>>
> If you have already mounted a /dev/da0p?, its label is removed from
> /dev/gpt - 'bootpart' is never mounted, that is why it's label remains.
> you just have to change /etc/fstab to the /dev/gpt/labels and then they
> will remain and get mounted - Or boot from a DVD, don't mount anything and
> you'll see the labels.
>
> ie:
> If you mount '/dev/da0p2'as '/' then '/dev/gpt/rootpart' will no longer be
> available, same goes for swap and everything else.  If you mount
> 'dev/gpt/rootpart' as '/', the you'll have both '/dev/da0p2' and
> '/dev/gpt/bootpart'
>
> ]Peter[
>
>
Thanks that solved it. !!
because i did not see them in /dev/gpt i did not change the /etc/fstab 
file to the appropiate config.
I thought if they are not there, then i can not use them.
Wrong assumption !!!
I edited /etc/fstab to mount /dev/gpt/rootpart on / and /dev/gpt/swap on 
swap, and the machine booted like it should.
Also the gpt entries are now there!

Thanks again!

Merry cristmas !!!

regards
Johan