4250-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>First 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>A</th><th>B</th>
  22             <th>B</th><th>B</th><th>-</th><th>-</th>
  23           </tr>
  24           <tr>
  25             <td style="font-style: italic;">b0</td>
  26             <td>-</td><td>-</td><td>-</td><td>X</td>
  27             <td>X</td><td>X</td><td>-</td><td>-</td>
  28           </tr>
  29         </table>
  30         <p style="font-size:20px;">Overlay.qcow2</p>
  31         <table class="disk">
  32           <tr>
  33             <th style="visibility:hidden;">b0</th>
  34             <th>-</th><th>-</th><th>C</th><th>C</th>
  35             <th>-</th><th>-</th><th>-</th><th>-</th>
  36           </tr>
  37           <tr>
  38             <td style="font-style: italic;">b0</td>
  39             <td>-</td><td>-</td><td>X</td><td>X</td>
  40             <td>-</td><td>-</td><td>-</td><td>-</td>
  41           </tr>
  42           <tr>
  43             <td style="font-style: italic;">b1</td>
  44             <td>-</td><td>-</td><td>-</td><td>-</td>
  45             <td>-</td><td>-</td><td>-</td><td>-</td>
  46           </tr>
  47           <tr style="color: blue;">
  48             <td style="font-style: italic;">t</td>
  49             <td>-</td><td>-</td><td>X</td><td>X</td>
  50             <td>X</td><td>X</td><td>-</td><td>-</td>
  51           </tr>
  52         </table>
  53       </td>
  54       <td style="vertical-align: top;">
  55         <p style="font-size:20px;">FullBackup.qcow2</p>
  56         <table class="disk">
  57           <tr>
  58             <th>A</th><th>-</th><th>A</th><th>A</th>
  59             <th>-</th><th>A</th><th>-</th><th>-</th>
  60           </tr>
  61         </table>
  62         <p style="font-size:20px;">IncBackup1.qcow2</p>
  63         <table class="disk">
  64           <tr>
  65             <th>-</th><th>-</th><th>C</th><th>C</th>
  66             <th>B</th><th>B</th><th>-</th><th>-</th>
  67           </tr>
  68         </table>
  69       </td>
  70     </tr>
  71   </table>
  72 </p>