dd vs. truncate for creating vkernel root images

[Nuno Antunes]

On 4/12/07, Justin C. Sherrill <justin at shiningsilence.com> wrote:
On Wed, April 11, 2007 6:00 pm, Nuno Antunes wrote:
> Hi all,
>
> Is there any advantage in using
> 'dd if=/dev/zero of=/var/vkernel/rootimg.01 bs=1m count=2048'
> over the much quicker
> 'truncate -s 2G /var/vkernel/rootimg.01'
> other than getting a root image filled with zeros?
Have you tried it?  What happened?


Yes I have, and it works. Vkernels can use a root image created this
way. So does it mean that the file will grow on demand (up to the
established size, of course)?
Thanks,
Nuno