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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Hi Brent and Ovidiu,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">As this email has a long history, I re-summarize the raw cache in StarlingX and Cinder upstream image cache.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Please vote whether we can abandon raw cache in StarlingX.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">StarlingX<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Create an image cache in ceph when Glance creates an image.
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">And delete the cached image in ceph when deleting the original image in Glance.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Cinder:<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">When creating a volume from an image in a backend storage at the first time, Cinder creates a volume from this image, and uses it as the image cache.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">So next time if users create another volume from this image in the same backend storage, Cinder at first finds out the cached image volume and clones a new volume
from it.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Cinder allows capacity configuration for cached images. If the space is used up, Cinder will evict the cached image volumes.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">From my viewpoint,
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Cinder image cache can achieve same functionality as Raw cache in StarlingX with more enhancement. It is for all Cinder supported backend storage, not just for
Ceph.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Best wishes<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Lisa<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> Li, Xiaoyan
<br>
<b>Sent:</b> Monday, November 19, 2018 9:44 AM<br>
<b>To:</b> Poncea, Ovidiu <Ovidiu.Poncea@windriver.com>; Rowsell, Brent <Brent.Rowsell@windriver.com>; 'starlingx-discuss@lists.starlingx.io' <starlingx-discuss@lists.starlingx.io><br>
<b>Subject:</b> RE: [Starlingx-discuss] [StarlingX] Use Cinder generic image cache to replace raw caching<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Hi Ovidiu,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">A cached image ( new volume from this image) is created on a storage backend when Cinder firstly creates a volume in the same backend storage from the image.
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">All the information are stored in Cinder, including volume id, image id etc.
<a href="https://github.com/openstack/cinder/blob/stable/pike/cinder/volume/manager.py#L1368">
https://github.com/openstack/cinder/blob/stable/pike/cinder/volume/manager.py#L1368</a>
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><a href="https://github.com/openstack/cinder/blob/stable/pike/cinder/image/cache.py#L82">https://github.com/openstack/cinder/blob/stable/pike/cinder/image/cache.py#L82</a>
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">A cached image is deleted when the configure space for cache is used up. So currently Cinder doesn’t delete the cached image volumes even if the image is deleted.
But this can be an enhancement of current cinder image cache.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><a href="https://github.com/openstack/cinder/blob/stable/pike/cinder/image/cache.py#L117">https://github.com/openstack/cinder/blob/stable/pike/cinder/image/cache.py#L117</a>
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><a href="https://github.com/openstack/cinder/blob/stable/pike/cinder/volume/manager.py#L1351">https://github.com/openstack/cinder/blob/stable/pike/cinder/volume/manager.py#L1351</a>
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Best wishes<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Lisa<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> Poncea, Ovidiu [<a href="mailto:Ovidiu.Poncea@windriver.com">mailto:Ovidiu.Poncea@windriver.com</a>]
<br>
<b>Sent:</b> Friday, November 16, 2018 4:57 PM<br>
<b>To:</b> Li, Xiaoyan <<a href="mailto:xiaoyan.li@intel.com">xiaoyan.li@intel.com</a>>; Rowsell, Brent <<a href="mailto:Brent.Rowsell@windriver.com">Brent.Rowsell@windriver.com</a>>; 'starlingx-discuss@lists.starlingx.io' <<a href="mailto:starlingx-discuss@lists.starlingx.io">starlingx-discuss@lists.starlingx.io</a>><br>
<b>Subject:</b> RE: [Starlingx-discuss] [StarlingX] Use Cinder generic image cache to replace raw caching<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Tahoma",sans-serif;color:black">Hi Li,<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Tahoma",sans-serif;color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Tahoma",sans-serif;color:black">Quick question: Is cache going to be freed when an image is deleted from glance? It would be a waste to cache images that are no longer needed.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Tahoma",sans-serif;color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Tahoma",sans-serif;color:black">Thanks,<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Tahoma",sans-serif;color:black">Ovidiu<o:p></o:p></span></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt"><b><span style="font-size:10.0pt;font-family:"Tahoma",sans-serif;color:black">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma",sans-serif;color:black"> Li, Xiaoyan [xiaoyan.li@intel.com]<br>
<b>Sent:</b> Tuesday, November 13, 2018 9:19 AM<br>
<b>To:</b> Rowsell, Brent; 'starlingx-discuss@lists.starlingx.io'<br>
<b>Subject:</b> Re: [Starlingx-discuss] [StarlingX] Use Cinder generic image cache to replace raw caching</span><span style="color:black"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Hi,</span><span style="color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"> </span><span style="color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">About the raw cache function in StarlingX Cinder and Glance, I would like to remove it as Cinder has similar function. Please see following detail.</span><span style="color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">And if I would like to remove the function in StarlingX, there are two methods:</span><span style="color:black"><o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-.25in"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">1.</span><span style="font-size:7.0pt;color:#1F497D">
</span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Submit a patch to revert the changes in Glance and Cinder.</span><span style="color:black"><o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-.25in"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">2.</span><span style="font-size:7.0pt;color:#1F497D">
</span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Ignore these patches during upgrading StarlingX/Cinder to new Cinder release.
</span><span style="color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Which way do we prefer to?</span><span style="color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"> </span><span style="color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Best wishes</span><span style="color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Lisa</span><span style="color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"> </span><span style="color:black"><o:p></o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:black">From:</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:black"> Li, Xiaoyan
<br>
<b>Sent:</b> Thursday, September 20, 2018 10:17 AM<br>
<b>To:</b> Rowsell, Brent <<a href="mailto:Brent.Rowsell@windriver.com">Brent.Rowsell@windriver.com</a>>;
<a href="mailto:starlingx-discuss@lists.starlingx.io">starlingx-discuss@lists.starlingx.io</a><br>
<b>Subject:</b> RE: [Starlingx-discuss] [StarlingX] Use Cinder generic image cache to replace raw caching</span><span style="color:black"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="color:black"> <o:p></o:p></span></p>
<p><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:black">Hi, Brent</span><span style="color:black"><o:p></o:p></span></p>
<p><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:black"> </span><span style="color:black"><o:p></o:p></span></p>
<p><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:black">The following are mechanism of Cinder volume cache.</span><span style="color:black"><o:p></o:p></span></p>
<p><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:black"> </span><span style="color:black"><o:p></o:p></span></p>
<p><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:black">Creation of cached volume:
</span><span style="color:black"><o:p></o:p></span></p>
<p><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:black">It creates a cached volume in the backend storage when creating from an image.</span><span style="color:black"><o:p></o:p></span></p>
<p style="margin-left:.5in;text-indent:-.25in"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:black">1.</span><span style="font-size:7.0pt;color:black">
</span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:black">Create_from_image:
</span><span style="color:black"><o:p></o:p></span></p>
<p><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:black"><a href="https://github.com/openstack/cinder/blob/stable/pike/cinder/volume/flows/manager/create_volume.py#L890" target="_blank">https://github.com/openstack/cinder/blob/stable/pike/cinder/volume/flows/manager/create_volume.py#L890</a></span><span style="color:black"><o:p></o:p></span></p>
<p style="margin-left:.5in;text-indent:-.25in"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:black">2.</span><span style="font-size:7.0pt;color:black">
</span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:black">Return image cache entry: If not existed, it creates a new entry.</span><span style="color:black"><o:p></o:p></span></p>
<p><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:black"><a href="https://github.com/openstack/cinder/blob/stable/pike/cinder/volume/flows/manager/create_volume.py#L746" target="_blank">https://github.com/openstack/cinder/blob/stable/pike/cinder/volume/flows/manager/create_volume.py#L746</a></span><span style="color:black"><o:p></o:p></span></p>
<p style="margin-left:.5in;text-indent:-.25in"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:black">3.</span><span style="font-size:7.0pt;color:black">
</span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:black">Create a new image-volume and cache entry for it:</span><span style="color:black"><o:p></o:p></span></p>
<p><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:black"><a href="https://github.com/openstack/cinder/blob/stable/pike/cinder/volume/flows/manager/create_volume.py#L872" target="_blank">https://github.com/openstack/cinder/blob/stable/pike/cinder/volume/flows/manager/create_volume.py#L872</a></span><span style="color:black"><o:p></o:p></span></p>
<p><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:black"> </span><span style="color:black"><o:p></o:p></span></p>
<p><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:black">Use a cached volume when creating a volume:</span><span style="color:black"><o:p></o:p></span></p>
<p><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:black"><a href="https://github.com/openstack/cinder/blob/stable/pike/cinder/volume/flows/manager/create_volume.py#L723-L735" target="_blank">https://github.com/openstack/cinder/blob/stable/pike/cinder/volume/flows/manager/create_volume.py#L723-L735</a>
</span><span style="color:black"><o:p></o:p></span></p>
<p><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:black"> </span><span style="color:black"><o:p></o:p></span></p>
<p><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:black"> Delete the cache volume: When capacity and number of cache entries exceed specified limit, it deletes cache entries (cached volumes).
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<p><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:black"><a href="https://github.com/openstack/cinder/blob/stable/pike/cinder/image/cache.py#L164" target="_blank">https://github.com/openstack/cinder/blob/stable/pike/cinder/image/cache.py#L164</a>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Best wishes</span><span style="color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Lisa</span><span style="color:black"><o:p></o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:black">From:</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:black"> Rowsell, Brent [<a href="mailto:Brent.Rowsell@windriver.com" target="_blank">mailto:Brent.Rowsell@windriver.com</a>]
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<b>Sent:</b> Thursday, September 6, 2018 10:02 AM<br>
<b>To:</b> Li, Xiaoyan <<a href="mailto:xiaoyan.li@intel.com" target="_blank">xiaoyan.li@intel.com</a>>;
<a href="mailto:starlingx-discuss@lists.starlingx.io" target="_blank">starlingx-discuss@lists.starlingx.io</a><br>
<b>Subject:</b> RE: [Starlingx-discuss] [StarlingX] Use Cinder generic image cache to replace raw caching</span><span style="color:black"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">We would need to review this feature to ensure it provides equivalent functionality first.
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">If it does, great, we can look at reverting and enabling this cinder functionality.
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Brent
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<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:black">From:</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:black"> Li, Xiaoyan [<a href="mailto:xiaoyan.li@intel.com" target="_blank">mailto:xiaoyan.li@intel.com</a>]
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<b>Sent:</b> Wednesday, September 5, 2018 9:59 PM<br>
<b>To:</b> <a href="mailto:starlingx-discuss@lists.starlingx.io" target="_blank">
starlingx-discuss@lists.starlingx.io</a><br>
<b>Subject:</b> [Starlingx-discuss] [StarlingX] Use Cinder generic image cache to replace raw caching</span><span style="color:black"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="color:black"> <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:black">Hi all,</span><span style="color:black"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:black">This email is about Raw caching function in StarlingX. This feature is to cache an image in backend storage like Ceph when we first create a volume in this backend
storage.</span><span style="color:black"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:black">In fact, Cinder upstream has already had a similar function in Pike release.
<a href="https://specs.openstack.org/openstack/cinder-specs/specs/liberty/image-volume-cache.html" target="_blank">
<span style="color:#0563C1">https://specs.openstack.org/openstack/cinder-specs/specs/liberty/image-volume-cache.html</span></a>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:black">So I want to revert Raw caching function in StarlingX, and use Cinder generic image cache instead.
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:black">The problem is that we need to update Cinder config in StarlingX. Any comments?
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:black">Best wishes</span><span style="color:black"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:black">Lisa</span><span style="color:black"><o:p></o:p></span></p>
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