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<p class="MsoNormal"><span style="font-size:11.0pt;color:black">Hello Nova developers,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:black">Cinder is working on a feature that will allow it to compress volumes uploaded to Glance [0,1]. We are proposing a new container_format for Glance named 'compressed' [2].<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:black">The idea is that a consumer of a 'compressed' image would read the file to determine the kind of compression and take appropriate action (either successfully decompress to find a payload that matches
the image's disk_format, or fail with 'unsupported container_format').<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:black">Our preliminary testing with a raw image with container_format == compressed, disk_format == raw is that Nova boots a VM from the image but the VM appears to be unusable. Nova seems taking it
as a real RAW image as disk_format indicates.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:black">So we want to open a discussion about handling this.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:black">Thanks!<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:black">[0] cinder spec patch
<a href="https://review.opendev.org/#/c/652275/">https://review.opendev.org/#/c/652275/</a><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:black">[1] cinder code implementation
<a href="https://review.opendev.org/#/c/668825">https://review.opendev.org/#/c/668825</a><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:black">[2] glance spec patch
<a href="https://review.opendev.org/#/c/670454/">https://review.opendev.org/#/c/670454/</a><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
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