geom_vinum problems (crashes and lockups)

Lukas Ertl le at
Sat Jun 26 12:07:56 GMT 2004

On Thu, 24 Jun 2004, Daryl Chance wrote:

> for /dev/ad4s1:
> mp3# bsdlabel /dev/ad4s1
> # /dev/ad4s1:
> 8 partitions:
> #        size   offset    fstype   [fsize bsize bps/cpg]
>  c: 60074784        0    unused        0     0
>  d: 60074784        0    4.2BSD     2048 16384 28512

This is a situation that I currently consider 'unsupported'.  The problem 
is that the 'd' partition has no offset, thus it is (from the point of 
view of a geom_vinum drive geom) the same as the 'c' partition.  This is 
the first problem.  The second problem is the on-disk format of a 
bsdlabel.  As far as I understand it, this meta-data is stored inside 
the first partition, so when you open the drive for writing (i.e. 
mount, fsck) you trigger a spoil event which cause all kinds of confusion 
for geom_vinum.

I'm not sure if I find a proper hack for this, so, for now, this is an 
unsupported configuration.  This means that the partition where you want 
to put a vinum drive on _must not_ start at the beginning of a drive and 
has to have an offset, i.e. 16 sectors, as a standard label from 'bsdlabel 
-w' has.


Lukas Ertl               
le at           

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