<div dir="ltr">According to Tony's info, it will take a very long time to create because it needs to convert first.<div>Like what Dominic said, not only wasting time but also wasting the compute node disk space in every creation.</div><div><br></div><div>Still suggest converting to RAW format first, only a long time to upload the Ceph for the first time.</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr"><<a href="mailto:DHilsbos@performair.com">DHilsbos@performair.com</a>> 於 2021年4月2日 週五 下午11:23寫道:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">Tony;<br>
<br>
In accordance with the second "Important" note listed here: <a href="https://docs.ceph.com/en/nautilus/rbd/rbd-openstack/" rel="noreferrer" target="_blank">https://docs.ceph.com/en/nautilus/rbd/rbd-openstack/</a>, we use all RAW images.<br>
<br>
Thank you,<br>
<br>
Dominic L. Hilsbos, MBA <br>
Director ? Information Technology <br>
Perform Air International Inc.<br>
DHilsbos@PerformAir.com <br>
<a href="http://www.PerformAir.com" rel="noreferrer" target="_blank">www.PerformAir.com</a><br>
<br>
<br>
-----Original Message-----<br>
From: Tony Liu [mailto:<a href="mailto:tonyliu0592@hotmail.com" target="_blank">tonyliu0592@hotmail.com</a>] <br>
Sent: Thursday, April 1, 2021 5:19 PM<br>
To: Dominic Hilsbos<br>
Cc: <a href="mailto:openstack-discuss@lists.openstack.org" target="_blank">openstack-discuss@lists.openstack.org</a>; <a href="mailto:missile0407@gmail.com" target="_blank">missile0407@gmail.com</a><br>
Subject: Re: launch VM on volume vs. image<br>
<br>
Hi Dominic,<br>
<br>
What's your image format?<br>
<br>
<br>
Thanks!<br>
Tony<br>
________________________________________<br>
From: <a href="mailto:DHilsbos@performair.com" target="_blank">DHilsbos@performair.com</a> <<a href="mailto:DHilsbos@performair.com" target="_blank">DHilsbos@performair.com</a>><br>
Sent: April 1, 2021 10:47 AM<br>
To: <a href="mailto:tonyliu0592@hotmail.com" target="_blank">tonyliu0592@hotmail.com</a><br>
Cc: <a href="mailto:openstack-discuss@lists.openstack.org" target="_blank">openstack-discuss@lists.openstack.org</a>; <a href="mailto:missile0407@gmail.com" target="_blank">missile0407@gmail.com</a><br>
Subject: RE: launch VM on volume vs. image<br>
<br>
Tony / Eddie;<br>
<br>
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.<br>
<br>
Thank you,<br>
<br>
Dominic L. Hilsbos, MBA<br>
Director ? Information Technology<br>
Perform Air International Inc.<br>
DHilsbos@PerformAir.com<br>
<a href="http://www.PerformAir.com" rel="noreferrer" target="_blank">www.PerformAir.com</a><br>
<br>
From: Eddie Yen [mailto:<a href="mailto:missile0407@gmail.com" target="_blank">missile0407@gmail.com</a>]<br>
Sent: Wednesday, March 31, 2021 6:00 PM<br>
To: Tony Liu<br>
Cc: <a href="mailto:openstack-discuss@lists.openstack.org" target="_blank">openstack-discuss@lists.openstack.org</a><br>
Subject: Re: launch VM on volume vs. image<br>
<br>
Hi Tony,<br>
<br>
In Ceph layer, IME, launching VM on image is creating a snapshot from source image in Nova ephemeral pool.<br>
If you check the RBD image created in Nova ephemeral pool, all images have their own parents from glance images.<br>
<br>
For launching VM on volume, it will "copy" the image to volume pool first, resize to specified disk size, then connect and boot.<br>
Because it's not create a snapshot from image, so it will take much longer.<br>
<br>
Eddie.<br>
<br>
Tony Liu <<a href="mailto:tonyliu0592@hotmail.com" target="_blank">tonyliu0592@hotmail.com</a>> 於 2021年4月1日 週四 上午8:09寫道:<br>
Hi,<br>
<br>
With Ceph as the backend storage, launching a VM on volume takes much<br>
longer than launching on image. Why is that?<br>
Could anyone elaborate the high level workflow for those two cases?<br>
<br>
<br>
Thanks!<br>
Tony<br>
</blockquote></div>