<div dir="ltr"><div>I eliminated software-bridge( using iperf3 bandwidth/latency on the host and guest was almost the same) and </div><div>disk write(using qemu-img convert src dest file both on the host and guestvm was comprable) being the issue.</div><div> </div><div>Next I profiled both sshd and qemu-img during the conversion phase using bpftools (profile and tcptop) and this is what i see.<br></div><div><br></div><div><table class="gmail-MsoTableGrid" border="1" cellspacing="0" cellpadding="0" style="border-collapse:collapse;border:none"> <tbody><tr> <td width="78" valign="top" style="width:58.25pt;border:1pt solid windowtext;padding:0in 5.4pt"> <p class="MsoNormal" style="margin:0in 0in 0.0001pt;font-size:12pt;font-family:Calibri,sans-serif">Time (min)</p> </td> <td width="168" valign="top" style="width:1.75in;border-top:1pt solid windowtext;border-right:1pt solid windowtext;border-bottom:1pt solid windowtext;border-left:none;padding:0in 5.4pt"> <p class="MsoNormal" style="margin:0in 0in 0.0001pt;font-size:12pt;font-family:Calibri,sans-serif">File Size</p> <p class="MsoNormal" style="margin:0in 0in 0.0001pt;font-size:12pt;font-family:Calibri,sans-serif">(KB) </p> </td> <td width="84" valign="top" style="width:63pt;border-top:1pt solid windowtext;border-right:1pt solid windowtext;border-bottom:1pt solid windowtext;border-left:none;padding:0in 5.4pt"> <p class="MsoNormal" style="margin:0in 0in 0.0001pt;font-size:12pt;font-family:Calibri,sans-serif">sshd RX</p> <p class="MsoNormal" style="margin:0in 0in 0.0001pt;font-size:12pt;font-family:Calibri,sans-serif">(KB)</p> <p class="MsoNormal" style="margin:0in 0in 0.0001pt;font-size:12pt;font-family:Calibri,sans-serif">tcptop</p> </td> <td width="138" valign="top" style="width:103.5pt;border-top:1pt solid windowtext;border-right:1pt solid windowtext;border-bottom:1pt solid windowtext;border-left:none;padding:0in 5.4pt"> <p class="MsoNormal" style="margin:0in 0in 0.0001pt;font-size:12pt;font-family:Calibri,sans-serif">qemu-img RX</p> <p class="MsoNormal" style="margin:0in 0in 0.0001pt;font-size:12pt;font-family:Calibri,sans-serif">(KB)</p> <p class="MsoNormal" style="margin:0in 0in 0.0001pt;font-size:12pt;font-family:Calibri,sans-serif">tcptop</p> </td> <td width="156" valign="top" style="width:116.75pt;border-top:1pt solid windowtext;border-right:1pt solid windowtext;border-bottom:1pt solid windowtext;border-left:none;padding:0in 5.4pt"> <p class="MsoNormal" style="margin:0in 0in 0.0001pt;font-size:12pt;font-family:Calibri,sans-serif">profile (flamegraph)</p> </td> </tr> <tr> <td width="78" valign="top" style="width:58.25pt;border-right:1pt solid windowtext;border-bottom:1pt solid windowtext;border-left:1pt solid windowtext;border-top:none;padding:0in 5.4pt"> <p class="MsoNormal" style="margin:0in 0in 0.0001pt;font-size:12pt;font-family:Calibri,sans-serif">0 - 5</p> </td> <td width="168" valign="top" style="width:1.75in;border-top:none;border-left:none;border-bottom:1pt solid windowtext;border-right:1pt solid windowtext;padding:0in 5.4pt"> <p class="MsoNormal" style="margin:0in 0in 0.0001pt;font-size:12pt;font-family:Calibri,sans-serif"><a name="OLE_LINK4"></a><a name="OLE_LINK3">5478400</a></p> </td> <td width="84" valign="top" style="width:63pt;border-top:none;border-left:none;border-bottom:1pt solid windowtext;border-right:1pt solid windowtext;padding:0in 5.4pt"> <p class="MsoNormal" style="margin:0in 0in 0.0001pt;font-size:12pt;font-family:Calibri,sans-serif">5612971</p> </td> <td width="138" valign="top" style="width:103.5pt;border-top:none;border-left:none;border-bottom:1pt solid windowtext;border-right:1pt solid windowtext;padding:0in 5.4pt"> <p class="MsoNormal" style="margin:0in 0in 0.0001pt;font-size:12pt;font-family:Calibri,sans-serif">5601536</p> </td> <td width="156" valign="top" style="width:116.75pt;border-top:none;border-left:none;border-bottom:1pt solid windowtext;border-right:1pt solid windowtext;padding:0in 5.4pt"> <p class="MsoNormal" style="margin:0in 0in 0.0001pt;font-size:12pt;font-family:Calibri,sans-serif"><a name="OLE_LINK22"></a><a name="OLE_LINK21">qemu-img-0-5.svg</a></p> </td> </tr> <tr> <td width="78" valign="top" style="width:58.25pt;border-right:1pt solid windowtext;border-bottom:1pt solid windowtext;border-left:1pt solid windowtext;border-top:none;padding:0in 5.4pt"> <p class="MsoNormal" style="margin:0in 0in 0.0001pt;font-size:12pt;font-family:Calibri,sans-serif">5 - 10</p> </td> <td width="168" valign="top" style="width:1.75in;border-top:none;border-left:none;border-bottom:1pt solid windowtext;border-right:1pt solid windowtext;padding:0in 5.4pt"> <p class="MsoNormal" style="margin:0in 0in 0.0001pt;font-size:12pt;font-family:Calibri,sans-serif"><a name="OLE_LINK2"></a><a name="OLE_LINK1">8365440</a> (+2887040)</p> </td> <td width="84" valign="top" style="width:63pt;border-top:none;border-left:none;border-bottom:1pt solid windowtext;border-right:1pt solid windowtext;padding:0in 5.4pt"> <p class="MsoNormal" style="margin:0in 0in 0.0001pt;font-size:12pt;font-family:Calibri,sans-serif">5669043</p> </td> <td width="138" valign="top" style="width:103.5pt;border-top:none;border-left:none;border-bottom:1pt solid windowtext;border-right:1pt solid windowtext;padding:0in 5.4pt"> <p class="MsoNormal" style="margin:0in 0in 0.0001pt;font-size:12pt;font-family:Calibri,sans-serif">5656517</p> </td> <td width="156" valign="top" style="width:116.75pt;border-top:none;border-left:none;border-bottom:1pt solid windowtext;border-right:1pt solid windowtext;padding:0in 5.4pt"> <p class="MsoNormal" style="margin:0in 0in 0.0001pt;font-size:12pt;font-family:Calibri,sans-serif">qemu-img-5-10.svg</p> </td> </tr> <tr> <td width="78" valign="top" style="width:58.25pt;border-right:1pt solid windowtext;border-bottom:1pt solid windowtext;border-left:1pt solid windowtext;border-top:none;padding:0in 5.4pt"> <p class="MsoNormal" style="margin:0in 0in 0.0001pt;font-size:12pt;font-family:Calibri,sans-serif">10 - 15</p> </td> <td width="168" valign="top" style="width:1.75in;border-top:none;border-left:none;border-bottom:1pt solid windowtext;border-right:1pt solid windowtext;padding:0in 5.4pt"> <p class="MsoNormal" style="margin:0in 0in 0.0001pt;font-size:12pt;font-family:Calibri,sans-serif"><a name="OLE_LINK6"></a><a name="OLE_LINK5">8423296</a> (+57856)</p> </td> <td width="84" valign="top" style="width:63pt;border-top:none;border-left:none;border-bottom:1pt solid windowtext;border-right:1pt solid windowtext;padding:0in 5.4pt"> <p class="MsoNormal" style="margin:0in 0in 0.0001pt;font-size:12pt;font-family:Calibri,sans-serif">5722376</p> </td> <td width="138" valign="top" style="width:103.5pt;border-top:none;border-left:none;border-bottom:1pt solid windowtext;border-right:1pt solid windowtext;padding:0in 5.4pt"> <p class="MsoNormal" style="margin:0in 0in 0.0001pt;font-size:12pt;font-family:Calibri,sans-serif">5708926</p> </td> <td width="156" valign="top" style="width:116.75pt;border-top:none;border-left:none;border-bottom:1pt solid windowtext;border-right:1pt solid windowtext;padding:0in 5.4pt"> <p class="MsoNormal" style="margin:0in 0in 0.0001pt;font-size:12pt;font-family:Calibri,sans-serif">qemu-img-10-15.svg</p> </td> </tr> <tr> <td width="78" valign="top" style="width:58.25pt;border-right:1pt solid windowtext;border-bottom:1pt solid windowtext;border-left:1pt solid windowtext;border-top:none;padding:0in 5.4pt"> <p class="MsoNormal" style="margin:0in 0in 0.0001pt;font-size:12pt;font-family:Calibri,sans-serif">15 - 20</p> </td> <td width="168" valign="top" style="width:1.75in;border-top:none;border-left:none;border-bottom:1pt solid windowtext;border-right:1pt solid windowtext;padding:0in 5.4pt"> <p class="MsoNormal" style="margin:0in 0in 0.0001pt;font-size:12pt;font-family:Calibri,sans-serif"><a name="OLE_LINK8"></a><a name="OLE_LINK7">9472128</a>(+1048832)</p> </td> <td width="84" valign="top" style="width:63pt;border-top:none;border-left:none;border-bottom:1pt solid windowtext;border-right:1pt solid windowtext;padding:0in 5.4pt"> <p class="MsoNormal" style="margin:0in 0in 0.0001pt;font-size:12pt;font-family:Calibri,sans-serif">5708230</p> </td> <td width="138" valign="top" style="width:103.5pt;border-top:none;border-left:none;border-bottom:1pt solid windowtext;border-right:1pt solid windowtext;padding:0in 5.4pt"> <p class="MsoNormal" style="margin:0in 0in 0.0001pt;font-size:12pt;font-family:Calibri,sans-serif">5693710</p> </td> <td width="156" valign="top" style="width:116.75pt;border-top:none;border-left:none;border-bottom:1pt solid windowtext;border-right:1pt solid windowtext;padding:0in 5.4pt"> <p class="MsoNormal" style="margin:0in 0in 0.0001pt;font-size:12pt;font-family:Calibri,sans-serif">qemu-img-15-20.svg</p> </td> </tr> <tr> <td width="78" valign="top" style="width:58.25pt;border-right:1pt solid windowtext;border-bottom:1pt solid windowtext;border-left:1pt solid windowtext;border-top:none;padding:0in 5.4pt"> <p class="MsoNormal" style="margin:0in 0in 0.0001pt;font-size:12pt;font-family:Calibri,sans-serif">20 - 25</p> </td> <td width="168" valign="top" style="width:1.75in;border-top:none;border-left:none;border-bottom:1pt solid windowtext;border-right:1pt solid windowtext;padding:0in 5.4pt"> <p class="MsoNormal" style="margin:0in 0in 0.0001pt;font-size:12pt;font-family:Calibri,sans-serif"><a name="OLE_LINK10"></a><a name="OLE_LINK9">9540992</a>(+68864)</p> </td> <td width="84" valign="top" style="width:63pt;border-top:none;border-left:none;border-bottom:1pt solid windowtext;border-right:1pt solid windowtext;padding:0in 5.4pt"> <p class="MsoNormal" style="margin:0in 0in 0.0001pt;font-size:12pt;font-family:Calibri,sans-serif">5723629</p> </td> <td width="138" valign="top" style="width:103.5pt;border-top:none;border-left:none;border-bottom:1pt solid windowtext;border-right:1pt solid windowtext;padding:0in 5.4pt"> <p class="MsoNormal" style="margin:0in 0in 0.0001pt;font-size:12pt;font-family:Calibri,sans-serif">5712002</p> </td> <td width="156" valign="top" style="width:116.75pt;border-top:none;border-left:none;border-bottom:1pt solid windowtext;border-right:1pt solid windowtext;padding:0in 5.4pt"> <p class="MsoNormal" style="margin:0in 0in 0.0001pt;font-size:12pt;font-family:Calibri,sans-serif">qemu-img-20-25.svg</p> </td> </tr> <tr> <td width="78" valign="top" style="width:58.25pt;border-right:1pt solid windowtext;border-bottom:1pt solid windowtext;border-left:1pt solid windowtext;border-top:none;padding:0in 5.4pt"> <p class="MsoNormal" style="margin:0in 0in 0.0001pt;font-size:12pt;font-family:Calibri,sans-serif">25 - 30</p> </td> <td width="168" valign="top" style="width:1.75in;border-top:none;border-left:none;border-bottom:1pt solid windowtext;border-right:1pt solid windowtext;padding:0in 5.4pt"> <p class="MsoNormal" style="margin:0in 0in 0.0001pt;font-size:12pt;font-family:Calibri,sans-serif"><a name="OLE_LINK12"></a><a name="OLE_LINK11">9617024</a>(+76032)</p> </td> <td width="84" valign="top" style="width:63pt;border-top:none;border-left:none;border-bottom:1pt solid windowtext;border-right:1pt solid windowtext;padding:0in 5.4pt"> <p class="MsoNormal" style="margin:0in 0in 0.0001pt;font-size:12pt;font-family:Calibri,sans-serif">5721568</p> </td> <td width="138" valign="top" style="width:103.5pt;border-top:none;border-left:none;border-bottom:1pt solid windowtext;border-right:1pt solid windowtext;padding:0in 5.4pt"> <p class="MsoNormal" style="margin:0in 0in 0.0001pt;font-size:12pt;font-family:Calibri,sans-serif">5708794</p> </td> <td width="156" valign="top" style="width:116.75pt;border-top:none;border-left:none;border-bottom:1pt solid windowtext;border-right:1pt solid windowtext;padding:0in 5.4pt"> <p class="MsoNormal" style="margin:0in 0in 0.0001pt;font-size:12pt;font-family:Calibri,sans-serif">qemu-img-25-30.svg</p> </td> </tr> <tr> <td width="78" valign="top" style="width:58.25pt;border-right:1pt solid windowtext;border-bottom:1pt solid windowtext;border-left:1pt solid windowtext;border-top:none;padding:0in 5.4pt"> <p class="MsoNormal" style="margin:0in 0in 0.0001pt;font-size:12pt;font-family:Calibri,sans-serif">30 - 35</p> </td> <td width="168" valign="top" style="width:1.75in;border-top:none;border-left:none;border-bottom:1pt solid windowtext;border-right:1pt solid windowtext;padding:0in 5.4pt"> <p class="MsoNormal" style="margin:0in 0in 0.0001pt;font-size:12pt;font-family:Calibri,sans-serif"><a name="OLE_LINK14"></a><a name="OLE_LINK13">11263040</a>(+10646016)</p> </td> <td width="84" valign="top" style="width:63pt;border-top:none;border-left:none;border-bottom:1pt solid windowtext;border-right:1pt solid windowtext;padding:0in 5.4pt"> <p class="MsoNormal" style="margin:0in 0in 0.0001pt;font-size:12pt;font-family:Calibri,sans-serif">5689537</p> </td> <td width="138" valign="top" style="width:103.5pt;border-top:none;border-left:none;border-bottom:1pt solid windowtext;border-right:1pt solid windowtext;padding:0in 5.4pt"> <p class="MsoNormal" style="margin:0in 0in 0.0001pt;font-size:12pt;font-family:Calibri,sans-serif">5678589</p> </td> <td width="156" valign="top" style="width:116.75pt;border-top:none;border-left:none;border-bottom:1pt solid windowtext;border-right:1pt solid windowtext;padding:0in 5.4pt"> <p class="MsoNormal" style="margin:0in 0in 0.0001pt;font-size:12pt;font-family:Calibri,sans-serif">qemu-img-30-35.svg</p> </td> </tr> <tr> <td width="78" valign="top" style="width:58.25pt;border-right:1pt solid windowtext;border-bottom:1pt solid windowtext;border-left:1pt solid windowtext;border-top:none;padding:0in 5.4pt"> <p class="MsoNormal" style="margin:0in 0in 0.0001pt;font-size:12pt;font-family:Calibri,sans-serif">35 – 40</p> </td> <td width="168" valign="top" style="width:1.75in;border-top:none;border-left:none;border-bottom:1pt solid windowtext;border-right:1pt solid windowtext;padding:0in 5.4pt"> <p class="MsoNormal" style="margin:0in 0in 0.0001pt;font-size:12pt;font-family:Calibri,sans-serif">11263040(+0)</p> </td> <td width="84" valign="top" style="width:63pt;border-top:none;border-left:none;border-bottom:1pt solid windowtext;border-right:1pt solid windowtext;padding:0in 5.4pt"> <p class="MsoNormal" style="margin:0in 0in 0.0001pt;font-size:12pt;font-family:Calibri,sans-serif">5722598</p> </td> <td width="138" valign="top" style="width:103.5pt;border-top:none;border-left:none;border-bottom:1pt solid windowtext;border-right:1pt solid windowtext;padding:0in 5.4pt"> <p class="MsoNormal" style="margin:0in 0in 0.0001pt;font-size:12pt;font-family:Calibri,sans-serif">5709954</p> </td> <td width="156" valign="top" style="width:116.75pt;border-top:none;border-left:none;border-bottom:1pt solid windowtext;border-right:1pt solid windowtext;padding:0in 5.4pt"> <p class="MsoNormal" style="margin:0in 0in 0.0001pt;font-size:12pt;font-family:Calibri,sans-serif">qemu-img-35-40.svg</p> </td> </tr> <tr> <td width="78" valign="top" style="width:58.25pt;border-right:1pt solid windowtext;border-bottom:1pt solid windowtext;border-left:1pt solid windowtext;border-top:none;padding:0in 5.4pt"> <p class="MsoNormal" style="margin:0in 0in 0.0001pt;font-size:12pt;font-family:Calibri,sans-serif">40 - 45</p> </td> <td width="168" valign="top" style="width:1.75in;border-top:none;border-left:none;border-bottom:1pt solid windowtext;border-right:1pt solid windowtext;padding:0in 5.4pt"> <p class="MsoNormal" style="margin:0in 0in 0.0001pt;font-size:12pt;font-family:Calibri,sans-serif"><a name="OLE_LINK16"></a><a name="OLE_LINK15">13252160</a>(+1989120)</p> </td> <td width="84" valign="top" style="width:63pt;border-top:none;border-left:none;border-bottom:1pt solid windowtext;border-right:1pt solid windowtext;padding:0in 5.4pt"> <p class="MsoNormal" style="margin:0in 0in 0.0001pt;font-size:12pt;font-family:Calibri,sans-serif">5693774</p> </td> <td width="138" valign="top" style="width:103.5pt;border-top:none;border-left:none;border-bottom:1pt solid windowtext;border-right:1pt solid windowtext;padding:0in 5.4pt"> <p class="MsoNormal" style="margin:0in 0in 0.0001pt;font-size:12pt;font-family:Calibri,sans-serif">5682506</p> </td> <td width="156" valign="top" style="width:116.75pt;border-top:none;border-left:none;border-bottom:1pt solid windowtext;border-right:1pt solid windowtext;padding:0in 5.4pt"> <p class="MsoNormal" style="margin:0in 0in 0.0001pt;font-size:12pt;font-family:Calibri,sans-serif">qemu-img-40-45.svg</p> </td> </tr> <tr> <td width="78" valign="top" style="width:58.25pt;border-right:1pt solid windowtext;border-bottom:1pt solid windowtext;border-left:1pt solid windowtext;border-top:none;padding:0in 5.4pt"> <p class="MsoNormal" style="margin:0in 0in 0.0001pt;font-size:12pt;font-family:Calibri,sans-serif">45 - 50</p> </td> <td width="168" valign="top" style="width:1.75in;border-top:none;border-left:none;border-bottom:1pt solid windowtext;border-right:1pt solid windowtext;padding:0in 5.4pt"> <p class="MsoNormal" style="margin:0in 0in 0.0001pt;font-size:12pt;font-family:Calibri,sans-serif"><a name="OLE_LINK18"></a><a name="OLE_LINK17">15272576</a>(+12020416)</p> </td> <td width="84" valign="top" style="width:63pt;border-top:none;border-left:none;border-bottom:1pt solid windowtext;border-right:1pt solid windowtext;padding:0in 5.4pt"> <p class="MsoNormal" style="margin:0in 0in 0.0001pt;font-size:12pt;font-family:Calibri,sans-serif">5698998</p> </td> <td width="138" valign="top" style="width:103.5pt;border-top:none;border-left:none;border-bottom:1pt solid windowtext;border-right:1pt solid windowtext;padding:0in 5.4pt"> <p class="MsoNormal" style="margin:0in 0in 0.0001pt;font-size:12pt;font-family:Calibri,sans-serif">5686398</p> </td> <td width="156" valign="top" style="width:116.75pt;border-top:none;border-left:none;border-bottom:1pt solid windowtext;border-right:1pt solid windowtext;padding:0in 5.4pt"> <p class="MsoNormal" style="margin:0in 0in 0.0001pt;font-size:12pt;font-family:Calibri,sans-serif">qemu-img-45-50.svg</p> </td> </tr> <tr> <td width="78" valign="top" style="width:58.25pt;border-right:1pt solid windowtext;border-bottom:1pt solid windowtext;border-left:1pt solid windowtext;border-top:none;padding:0in 5.4pt"> <p class="MsoNormal" style="margin:0in 0in 0.0001pt;font-size:12pt;font-family:Calibri,sans-serif">50 - 55</p> </td> <td width="168" valign="top" style="width:1.75in;border-top:none;border-left:none;border-bottom:1pt solid windowtext;border-right:1pt solid windowtext;padding:0in 5.4pt"> <p class="MsoNormal" style="margin:0in 0in 0.0001pt;font-size:12pt;font-family:Calibri,sans-serif"><a name="OLE_LINK20"></a><a name="OLE_LINK19">15272704</a>(128)</p> </td> <td width="84" valign="top" style="width:63pt;border-top:none;border-left:none;border-bottom:1pt solid windowtext;border-right:1pt solid windowtext;padding:0in 5.4pt"> <p class="MsoNormal" style="margin:0in 0in 0.0001pt;font-size:12pt;font-family:Calibri,sans-serif">985500</p> </td> <td width="138" valign="top" style="width:103.5pt;border-top:none;border-left:none;border-bottom:1pt solid windowtext;border-right:1pt solid windowtext;padding:0in 5.4pt"> <p class="MsoNormal" style="margin:0in 0in 0.0001pt;font-size:12pt;font-family:Calibri,sans-serif">983322</p> </td> <td width="156" valign="top" style="width:116.75pt;border-top:none;border-left:none;border-bottom:1pt solid windowtext;border-right:1pt solid windowtext;padding:0in 5.4pt"> <p class="MsoNormal" style="margin:0in 0in 0.0001pt;font-size:12pt;font-family:Calibri,sans-serif">qemu-img-50-55.svg</p> </td> </tr> </tbody></table><br></div><div>Bulk of the write to the "-sda" file completed within 15-20 mins although sshd/qemu-img receives constant stream of data from the nbd-server</div><div>I'm not sure if this is because of "sparseness" (Not sure if the sparsifying is handled on the nbd-server side or on the receiving side)</div><div><br></div><div>The flamegraph also show not much of disk write happening after 20 mins. (mostly poll and recv_msg)</div><div><br></div><div>I am yet todo a similar experiment when running on the "host" to actually compare the behavior.</div><div><br></div><div>Does this provide any clues?</div><div><br></div><div>thanks</div><div>Suresh</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Wed, Apr 10, 2019 at 10:30 AM Richard W.M. Jones <<a href="mailto:rjones@redhat.com" target="_blank">rjones@redhat.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">On Wed, Apr 10, 2019 at 10:15:43AM -0700, Sureshkumar Kaliannan wrote:<br> > thanks Richard,<br> > <br> > The experiment was indeed done with nested VM enabled. I am not sure about<br> > the internals, but i thought once overlay is setup the 2 main processes are<br> > sshd and qemu-img convert (reading data from sshd and doing the conversion)<br> <br> Yes this should be true. I wouldn't expect copying to be slower.<br> <br> So initial guess probably wrong. I wonder if there are some extra<br> steps such as a slow software bridge or openvswitch on the host?<br> <br> > I don't see any of the qemu process running.<br> <br> As per <a href="http://libguestfs.org/virt-p2v.1.html#how-virt-p2v-works" rel="noreferrer" target="_blank">http://libguestfs.org/virt-p2v.1.html#how-virt-p2v-works</a> you<br> should see qemu-nbd running on the physical server, and qemu-img<br> running on the conversion server during the copying phase.<br> <br> > Initial overlay setup was pretty quick and rest of the time was spent in<br> > qemu-img convert operation<br> <br> Indeed qemu should exit before copying starts.<br> <br> Rich.<br> <br> -- <br> Richard Jones, Virtualization Group, Red Hat <a href="http://people.redhat.com/~rjones" rel="noreferrer" target="_blank">http://people.redhat.com/~rjones</a><br> Read my programming and virtualization blog: <a href="http://rwmj.wordpress.com" rel="noreferrer" target="_blank">http://rwmj.wordpress.com</a><br> virt-df lists disk usage of guests without needing to install any<br> software inside the virtual machine. Supports Linux and Windows.<br> <a href="http://people.redhat.com/~rjones/virt-df/" rel="noreferrer" target="_blank">http://people.redhat.com/~rjones/virt-df/</a><br> </blockquote></div>