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Also this is what I've noticed with the centos cloud image I downloaded. If
I add few packages( around a GB), the sizes goes up to 8GB from 1.3 GB.
Running dd if=/dev/zero of=temp;sync;rm temp failed due to the size of the
disk on the cloud images which is 10G. zeroing failed with No space left on
device.  Any other options?

Thanks
Paras.

On Tue, Aug 1, 2017 at 9:43 AM, Paras pradhan <pradhanparas at gmail.com>
wrote:

> I ran virt-sparsify. So before running virt-sparsify it was 6.0GB and
> after it is 1.3GB.
>
> Thanks
> Paras.
>
> On Tue, Aug 1, 2017 at 2:53 AM, Tomáš Vondra <vondra at homeatcloud.cz>
> wrote:
>
>> Hi!
>>
>> How big are the actual image files? Because qcow2 is a sparse format, it
>> does not store zeroes. If the free space in one image is zeroed out, it
>> will convert much faster. If that is the problem, use „dd if=/dev/zero
>> of=temp;sync;rm temp“ or zerofree.
>>
>> Tomas
>>
>>
>>
>> *From:* Paras pradhan [mailto:pradhanparas at gmail.com]
>> *Sent:* Monday, July 31, 2017 11:54 PM
>> *To:* openstack-operators at lists.openstack.org
>> *Subject:* [Openstack-operators] custom build image is slow
>>
>>
>>
>> Hello
>>
>>
>>
>> I have two qcow2 images uploaded to glance. One is CentOS 7 cloud image
>> downloaded from centos.org.  The other one is custom built using CentOS
>> 7.DVD.  When I create cinder volumes from them, volume creation from the
>> custom built image it is very very slow.
>>
>>
>>
>>
>>
>> CenOS qcow2:
>>
>>
>>
>> 2017-07-31 21:42:44.287 881609 INFO cinder.image.image_utils
>> [req-ea2d7b12-ae9e-45b2-8b4b-ea8465497d5a e090e605170a778610438bfabad7aa
>> 7764d0a77ef520ae392e2b59074c9f88cf 490910c1d4e1486d8e3a62d7c0ae698e -
>> d67a18e70dd9467db25b74d33feaad6d default] *Converted 8192.00 MB image at
>> 253.19 MB/s*
>>
>>
>>
>> Custom built qcow2:
>>
>> INFO cinder.image.image_utils [req-032292d8-1500-474d-95c7-2e8424e2b864
>> e090e605170a778610438bfabad7aa7764d0a77ef520ae392e2b59074c9f88cf
>> 490910c1d4e1486d8e3a62d7c0ae698e - d67a18e70dd9467db25b74d33feaad6d
>> default] *Converted 10240.00 MB image at 32.22 MB/s*
>>
>>
>>
>> I used the following command to create the qcow2 file
>>
>> qemu-img create -f qcow2 custom.qcow2 10G
>>
>>
>>
>> What am I missing ?
>>
>>
>>
>> Thanks
>> Paras.
>>
>>
>>
>>
>>
>
>
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