vinum limits disk size to 255MB

[Greg 'groggy' Lehey]

On Monday,  6 December 2004 at  0:28:01 +0100, Markus Hoenicka wrote:
> Hi all,
>
> I'm trying to set up vinum on a freshly installed FreeBSD 5.3-BETA7
> box. The system is installed on da0. I want to use three 18G SCSI
> drives to create a vinum volume.
>
> For some reason vinum believes the disks hold a mere 255MB. This is
> what vinum sets the subdisk length if I specify "0m" as the length
> (meaning "use all available space" according to the manual). If I
> specify any larger size manually, vinum complains that there is "No
> space left on device" which strikes me odd. I *believe* that the fdisk
> and bsdlabel outputs reprinted below show that the disks are indeed
> 18G. According to my math, the appropriate size to specify in the
> vinum configuration would be 35566215s, that is the number of sectors
> of the smaller disks minus 265.
>
> I see only one minor problem: The disks are not identical, with
> da1 having a slightly larger capacity than da2 and da3.
>
> Can anyone throw me a ring here?

You don't say whether you're using vinum or gvinum.  I've never seen
this problem before, but if you're getting incorrect subdisk sizes,
try specifying them explicitly:

 sd length 35840952s drive ibma 

I wonder whether the problem is related to specifying the size as 0m
instead of 0.  It shouldn't be.

Greg
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