From: Eric Blake <eblake@redhat.com>
Date: Mon, 28 Oct 2019 13:57:08 +0000 (+0100)
Subject: 8000: Add pro/con table.
X-Git-Url: http://git.annexia.org/?a=commitdiff_plain;h=0f537a329d2a7988e276e14ec680f195f42e236a;p=libguestfs-talks.git

8000: Add pro/con table.
---

diff --git a/2019-kvm-forum/8000-resize-overview.html b/2019-kvm-forum/8000-resize-overview.html
index 58fc130..92356be 100644
--- a/2019-kvm-forum/8000-resize-overview.html
+++ b/2019-kvm-forum/8000-resize-overview.html
@@ -5,17 +5,48 @@
 <h1>Using qcow2 with NBD</h1>
 
 <p>
-  Filler - need to demonstrate:
+  <table style="border:1px solid black;">
+    <tr>
+      <th>XXX: better header...</th>
+      <th>qemu -> (raw) -> qemu-nbd -> (qcow2) -> image.qcow2</th>
+      <th>qemu -> (qcow2) -> qemu-nbd -> (raw) -> image.qcow2</th>
+    </tr>
+    <tr>
+      <td>Pro</td>
+      <td>
+	<ul>
+	  <li>Matches existing use
+	  <li>Server can start with thin qcow2, and grow it as needed
+	    with guest activity
+	</ul>
+      </td>
+      <td>
+	<ul>
+	  <li>Guest-visible size can be changed
+	  <li>Backing files
+	  <li>Dirty bitmap tracking
+	  <li>Any other qcow2 features...
+	</ul>
+      </td>
+    </tr>
+    <tr>
+      <td>Con</td>
+      <td>
+      	<ul>
+	  <li>Guest size is fixed
+	  <li>No access to qcow2 features from client
+	</ul>
+      </td>
+      <td>
+	<ul>
+	  <li>Server file must be preallocated, or else guest hits ENOSPC
+	  <li>Internal snapshots are unlikely to work
+	</ul>
+      </td>
+    </tr>
+  </table>
 
-  <pre>
-  qemu -> (raw) -> qemu-nbd -> (qcow2) -> image.qcow2
-  qemu -> (qcow2) -> qemu-nbd -> (raw) -> image.qcow2
-  </pre>
-
-  maybe a table of pro/con for each
-
-<p>
-  Exposing qcow2 over NBD is too risky without resize, forcing
-  existing documentation to favor raw over NBD, even though this loses
-  out on the other benefits of qcow2.
+  <p>Can we merge the best of both worlds, giving the client access to
+  all qcow2 features, but permitting resize of the underlying file on
+  the host?
 </p>
diff --git a/2019-kvm-forum/style.css b/2019-kvm-forum/style.css
index e33ca15..360d5be 100644
--- a/2019-kvm-forum/style.css
+++ b/2019-kvm-forum/style.css
@@ -270,3 +270,12 @@ p.attribution {
     text-align: right;
     font-size: 10pt;
 }
+
+/* Tables */
+table {
+    border-collapse: collapse;
+}
+
+table, th, td {
+    border: 1px solid black;
+}