Re: [Xen-users] Wrong size on a domU partition

[Simon Hobson <linux@xxxxxxxxxxxxxxxx>]

Ervin Novak wrote:

>  > I create the file with this command
> >
>  > dd if=/dev/zero of=/xen/domains/SRV03/opt-disk.img bs=1024k seek=30720
> >  count=30720
> Why are you using the seek= parameter? This is the cause of your
> "problem" (actually, everything is happening in the way you want, but
> this isn't needed for that).
It's a standard technique for creating a sparse file. The problem is 
specifying count as well as seek - so it's seeking over 30G (creating 
a sparse file), and then adding 30G of zeros.
The command should be :
dd if=/dev/zero of=/xen/domains/SRV03/opt-disk.img bs=1024k seek=30719 count=1

This will seek to 1M under 30G (( 30 * 1024 ) - 1 ), and then write 
1M of zeros.
--
Simon Hobson

Visit http://www.magpiesnestpublishing.co.uk/ for books by acclaimed
author Gladys Hobson. Novels - poetry - short stories - ideal as
Christmas stocking fillers. Some available as e-books.

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