Adding partition

Jerry McAllister jerrymc at
Mon Mar 13 20:27:34 UTC 2006

> Good Day,
> There is free space at the end of my disk and I want to move
> /usr/ports do a dedicated partition.
> # disklabel /dev/ad10s1
> # /dev/ad10s1:
> 8 partitions:
> #        size   offset    fstype   [fsize bsize bps/cpg]
>    a:  1024000        0    4.2BSD     2048 16384 64008
>    b:  2252800 44032000      swap
>    c: 368627427        0    unused        0     0   # "raw"
>    d:  2048000  1024000    4.2BSD     2048 16384 28552
>    e: 20480000  3072000    4.2BSD     2048 16384 28552
>    f: 20480000 23552000    4.2BSD     2048 16384 28552
> I want to add a g partition with 10 GByte to end.
> When I enter "disklabel -e /dev/ad10s1" vi opens and I add
> the following line to the end:
>    g: 20480000 44032000    4.2BSD     2048 16384 28552
> Upon saving I get an error that partitions "c" and "g" overlap.
> As far as I have read this is on purpose. How can I avoid the
> error message?

I don't know why it would say that c and g overlap, but you have
forgot to include the space used for swap in the offset.
Your offset should really be 46284800.

I have heard that some people think you should put your swap at the
highest address, but I don't think that applies in any significant
way to modern drives.    I could be wrong on that, though.  
Anyway, using the partition labels out of order does lead to confusion
and errors in calculations - in my experience.   

By the way, did you notice that you can use '*' in the offset field and 
bsdlabel (or disklabel since 4.xx) will calculate it for you.   You can 
even put a '*' in the last partition (highest address) size AND offset 
fields and bsdlabel will calculate it for you. 

I also wonder at your keeping such a large chunk of the FreeBSD slice
unallocated that way.   Now, if you had reduced the slice, I would think
you were saving it for another OS.   But it is already in FreeBSD space
so just put it all in g:   But, to each their own.


> I tried it via sysinstall but didn't work either. When saving
> the new disklabels I get "Unable to write data to disk ad10".
> I assume that is because ad10 is currently mounted?
> Thank you!
> Markus
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