[one-users] qcow2: empty datablock image creation with preallocation

[Liu, Guang Jun (Gene)]

Thank you all for your answer and information!

Gene
On 13-12-03 07:09 AM, Jaime Melis wrote:
> Hi Lorenzo,
>
> not out of the box. You will need to manually modify the DS drivers.
> You will need to modify:
> https://github.com/OpenNebula/one/blob/release-4.4/src/datastore_mad/remotes/fs/mkfs
>
> And replace the 'dd' command with your own.
>
> I would probably do something like: https://gist.github.com/jmelis/7768171
> (I haven't tested it, so it probably has bugs. You also need to write
> the actual command)
>
> Let me know if you need any further advice.
>
> Cheers,
> Jaime
>
>
> On Mon, Dec 2, 2013 at 6:29 PM, Lorenzo Faleschini
> <lorenzo.faleschini at nordestsystems.com
> <mailto:lorenzo.faleschini at nordestsystems.com>> wrote:
>
>     Hi
>
>     is it possible to create in sunstone (or via CLI) an
>     empty-datablock qcow2 with preallocation (-o preallocation=metadata).
>
>     I need it to avoid the auto-grow overhead.
>
>     for now I create the prealloc qcow2 image then I import it in one.
>
>     is it posible to avoid this step?
>     any suggestions or alternatives?
>
>     thanks
>
>     Lorenzo
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>
>
> -- 
> Jaime Melis
> C12G Labs - Flexible Enterprise Cloud Made Simple
> http://www.c12g.com | jmelis at c12g.com <mailto:jmelis at c12g.com>
>
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