4280-libvirt-checkpoints.html

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   5 <h1>Mixing backups with external snapshots</h1>
   6
   7 <ul>
   8   <li>managing disabled bitmaps in libvirt proved to be too complex</li>
   9   <li>each checkpoint creates a new bitmap, but all bitmaps are left active</li>
  10   <li>bitmaps are copied or merged alongside block job tasks</li></li>
  11 </ul>
  12
  13 <p>Second incremental backup
  14   <table>
  15     <tr>
  16       <td style="vertical-align: top;">
  17         <p style="font-size:20px;">Base.qcow2</p>
  18         <table class="disk">
  19           <tr>
  20             <th style="visibility:hidden;">b0</th>
  21             <th>A</th><th>-</th><th>C</th><th>C</th>
  22             <th>B</th><th>B</th><th>D</th><th>-</th>
  23           </tr>
  24           <tr>
  25             <td style="font-style: italic;">b0</td>
  26             <td>-</td><td>-</td><td>X</td><td>X</td>
  27             <td>X</td><td>X</td><td>X</td><td>-</td>
  28           </tr>
  29           <tr>
  30             <td style="font-style: italic;">b1</td>
  31             <td>-</td><td>-</td><td>-</td><td>-</td>
  32             <td>-</td><td>-</td><td>X</td><td>-</td>
  33           </tr>
  34           <tr style="color: blue;">
  35             <td style="font-style: italic;">t</td>
  36             <td>-</td><td>-</td><td>-</td><td>-</td>
  37             <td>-</td><td>-</td><td>X</td><td>-</td>
  38           </tr>
  39         </table>
  40       </td>
  41       <td style="vertical-align: top;">
  42         <p style="font-size:20px;">FullBackup.qcow2</p>
  43         <table class="disk">
  44           <tr>
  45             <th>A</th><th>-</th><th>A</th><th>A</th>
  46             <th>-</th><th>A</th><th>-</th><th>-</th>
  47           </tr>
  48         </table>
  49         <p style="font-size:20px;">IncBackup1.qcow2</p>
  50         <table class="disk">
  51           <tr>
  52             <th>-</th><th>-</th><th>C</th><th>C</th>
  53             <th>B</th><th>B</th><th>-</th><th>-</th>
  54           </tr>
  55         </table>
  56         <p style="font-size:20px;">IncBackup2.qcow2</p>
  57         <table class="disk">
  58           <tr>
  59             <th>-</th><th>-</th><th>-</th><th>-</th>
  60             <th>-</th><th>-</th><th>D</th><th>-</th>
  61           </tr>
  62         </table>
  63       </td>
  64     </tr>
  65   </table>
  66 </p>