Open Stack

Hi Martinx,
currently nova only supports "fallocate" to preallocate space.
Use the confirmation option "preallocate_images=space".

"preallocation=metadata" is mentioned in
https://blueprints.launchpad.net/nova/+spec/preallocated-images
as future work.

Belmiro

-----------------------
Belmiro Moreira
CERN



On Sat, Jul 12, 2014 at 3:04 AM, Martinx - ジェームズ <thiagocmartinsc at gmail.com>
wrote:

> When I said "which is slower", I meant that it makes that running Instance
> slower later... With preallocatoin=metadata, the running instances will be
> a bit faster without losing storage space with lots of zeros...
>
> My /var/lib/nova/insntances subdir in a XFS File System on top of a
> hardware RAID...
>
>
> On 11 July 2014 20:54, Martinx - ジェームズ <thiagocmartinsc at gmail.com> wrote:
>
>> Guys,
>>
>>  How can I configure the Compute Node, to create its qcow2 images, using
>> preallocation?
>>
>>  Currently, OpenStack Nova Compute creates the instance image, using
>> "qemu-img create" without passing the option "-o preallocation=metadata" to
>> it, which is slower.
>>
>>  So, how can I reconfigure nova compute to make use of preallocation?!
>>
>>  Libvirt supports it, commits:
>>
>>
>> http://libvirt.org/git/?p=libvirt.git;a=commit;h=1c9a2fb1aef1729ac86cd6648b5c2b7584f5f698
>>
>>
>> http://libvirt.org/git/?p=libvirt.git;a=commit;h=790dfee5eaf8600282da5a3d61bf807516f1b87e
>>
>> Tks!
>> Thiago
>>
>
>
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