openstack team mailing list archive

[Jae Sang Lee <hyangii@xxxxxxxxx>]

Hi,

You should to modify nova.virt.libvirt.connection._create_image.

This is source code about make a local disk.

 959         local_gb = inst['local_gb']
 960         if local_gb and not self._volume_in_mapping(
 961             self.default_local_device, block_device_info):
 962             fn = functools.partial(self._create_ephemeral,
 963                                    fs_label='ephemeral0',
 964                                    os_type=inst.os_type)
 965             self._cache_image(fn=fn,
 966                               target=basepath('disk.local'),
 967                               fname="ephemeral_%s_%s_%s" %
 968                               ("0", local_gb, inst.os_type),
 969                               cow=*FLAGS.use_cow_images*,
 970                               local_size=local_gb)

You can change 'cow' value to FALSE. (FLAGS.use_cow_images is TRUE by
default). then _cache_image function make a disk to raw format.


2011/11/8 ljvsss <ljvsss@xxxxxxxxx>

> hi all
>
> if i create an instance flavor of m1.large(4u,8GRAM.80G disk),at floder
> here /var/lib/nova/instances/instance-0000006 will have two img：disk and
> disk.local
> they format is same，qcow2 or raw
> what i want is the "disk" (instance os disk) format  is qcow2,and the
> disk.local's format is  raw,because qcow2 is small and easy to make
> snapshots,raw's speed is bettter
>
> what should i do?
>
> thanks :)
>
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