Open Stack

According to Tony's info, it will take a very long time to create because
it needs to convert first.
Like what Dominic said, not only wasting time but also wasting the compute
node disk space in every creation.

Still suggest converting to RAW format first, only a long time to upload
the Ceph for the first time.

<DHilsbos at performair.com> 於 2021年4月2日 週五 下午11:23寫道：

> Tony;
>
> In accordance with the second "Important" note listed here:
> https://docs.ceph.com/en/nautilus/rbd/rbd-openstack/, we use all RAW
> images.
>
> Thank you,
>
> Dominic L. Hilsbos, MBA
> Director ? Information Technology
> Perform Air International Inc.
> DHilsbos at PerformAir.com
> www.PerformAir.com
>
>
> -----Original Message-----
> From: Tony Liu [mailto:tonyliu0592 at hotmail.com]
> Sent: Thursday, April 1, 2021 5:19 PM
> To: Dominic Hilsbos
> Cc: openstack-discuss at lists.openstack.org; missile0407 at gmail.com
> Subject: Re: launch VM on volume vs. image
>
> Hi Dominic,
>
> What's your image format?
>
>
> Thanks!
> Tony
> ________________________________________
> From: DHilsbos at performair.com <DHilsbos at performair.com>
> Sent: April 1, 2021 10:47 AM
> To: tonyliu0592 at hotmail.com
> Cc: openstack-discuss at lists.openstack.org; missile0407 at gmail.com
> Subject: RE: launch VM on volume vs. image
>
> Tony / Eddie;
>
> I think this is partially dependent on the version of OpenStack running.
> In our Victoria cloud, a volume created from an image is also done as a
> snapshot by Ceph, and is completed in seconds.
>
> Thank you,
>
> Dominic L. Hilsbos, MBA
> Director ? Information Technology
> Perform Air International Inc.
> DHilsbos at PerformAir.com
> www.PerformAir.com
>
> From: Eddie Yen [mailto:missile0407 at gmail.com]
> Sent: Wednesday, March 31, 2021 6:00 PM
> To: Tony Liu
> Cc: openstack-discuss at lists.openstack.org
> Subject: Re: launch VM on volume vs. image
>
> Hi Tony,
>
> In Ceph layer, IME, launching VM on image is creating a snapshot from
> source image in Nova ephemeral pool.
> If you check the RBD image created in Nova ephemeral pool, all images have
> their own parents from glance images.
>
> For launching VM on volume, it will "copy" the image to volume pool first,
> resize to specified disk size, then connect and boot.
> Because it's not create a snapshot from image, so it will take much longer.
>
> Eddie.
>
> Tony Liu <tonyliu0592 at hotmail.com> 於 2021年4月1日 週四 上午8:09寫道：
> Hi,
>
> With Ceph as the backend storage, launching a VM on volume takes much
> longer than launching on image. Why is that?
> Could anyone elaborate the high level workflow for those two cases?
>
>
> Thanks!
> Tony
>
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