First cut at 8000- slides to match notes.

diff --git a/2019-kvm-forum/8000-resize-overview.html b/2019-kvm-forum/8000-resize-overview.html
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+++ b/2019-kvm-forum/8000-resize-overview.html
@@ -0,0 +1,21 @@
+<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
+<link rel="stylesheet" href="style.css" type="text/css"/>
+<script src="code.js" type="text/javascript"></script>
+
+<h1>Using qcow2 with NBD</h1>
+
+<p>
+  Filler - need to demonstrate:
+
+  <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>

diff --git a/2019-kvm-forum/8100-tradeoff-automatic-v-explicit.html b/2019-kvm-forum/8100-tradeoff-automatic-v-explicit.html
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@@ -0,0 +1,19 @@
+<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
+<link rel="stylesheet" href="style.css" type="text/css"/>
+<script src="code.js" type="text/javascript"></script>
+
+<h1>Tradeoff: Automatic or explicit</h1>
+
+<p>
+  Filler - need to demonstrate:
+  start with 1k image
+
+  <p>
+    Automatic (like file system):
+    <br>NBD_CMD_WRITE(offset=0,len=2k) -> success, size now 2k
+  <p>
+    Explicit (like block device):
+    <br>NBD_CMD_WRITE(offset=0,len=2k) -> fails
+    <br>NBD_CMD_RESIZE(2k) -> success, size now 2k
+    <br>NBD_CMD_WRITE(offset=0,len=2k) -> success
+</p>

diff --git a/2019-kvm-forum/8200-tradeoff-simple-v-structured.html b/2019-kvm-forum/8200-tradeoff-simple-v-structured.html
new file mode 100644 (file)
index 0000000..6ca9385
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+++ b/2019-kvm-forum/8200-tradeoff-simple-v-structured.html
@@ -0,0 +1,16 @@
+<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
+<link rel="stylesheet" href="style.css" type="text/css"/>
+<script src="code.js" type="text/javascript"></script>
+
+<h1>Tradeoff: Simple or structured</h1>
+
+<p>
+  Filler - need graphics showing wire format of:
+
+<p>
+  Simple: 16-byte response, boolean answer
+<p>
+  Structured: 1 or more 20+-byte response
+  <br>Adding new NBD_REPLY_TYPE_RESIZE allows including updated size
+  in response
+</p>

diff --git a/2019-kvm-forum/8300-tradeoff-poll-v-notify.html b/2019-kvm-forum/8300-tradeoff-poll-v-notify.html
new file mode 100644 (file)
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+++ b/2019-kvm-forum/8300-tradeoff-poll-v-notify.html
@@ -0,0 +1,26 @@
+<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
+<link rel="stylesheet" href="style.css" type="text/css"/>
+<script src="code.js" type="text/javascript"></script>
+
+<h1>Tradeoff: poll or notify</h1>
+
+<p>
+  Filler - need to demonstrate:
+
+<p>
+  polling (server cannot tell client about async changes unless client
+  polls):
+  <br>client: NBD_CMD_RESIZE(0)
+  <br>server: NBD_REPLY_TYPE_RESIZE response, including NBD_REPLY_DONE
+  <br>do stuff
+  <br>client: NBD_CMD_RESIZE(0)
+  <br>server: NBD_REPLY_TYPE_RESIZE response, including NBD_REPLY_DONE
+<p>
+  notify (client registers open-ended command to allow multiple async
+  server responses as needed):
+  <br>client: NBD_CMD_RESIZE(NBD_CMD_FLAG_NOTIFY)
+  <br>do stuff
+  <br>server: NBD_REPLY_TYPE_RESIZE response, excluding NBD_REPLY_DONE
+  <br>do stuff
+  <br>server: NBD_REPLY_TYPE_RESIZE response, excluding NBD_REPLY_DONE
+</p>

diff --git a/2019-kvm-forum/8400-tradeoff-complexity-issues.html b/2019-kvm-forum/8400-tradeoff-complexity-issues.html
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+++ b/2019-kvm-forum/8400-tradeoff-complexity-issues.html
@@ -0,0 +1,30 @@
+<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
+<link rel="stylesheet" href="style.css" type="text/css"/>
+<script src="code.js" type="text/javascript"></script>
+
+<h1>Tradeoff: how much complexity</h1>
+
+<p>
+  Filler - summarize various options. Maybe a 2-d graph with:
+
+  <pre>
+    c |
+    l |
+ ^  i |
+    e |
+ i  n |
+ n  t |  multiple knobs,
+ c    |  requires multiple
+ r  c |  fallbacks, but a
+ e  o |  non-SR solution works
+ a  m |
+ s  p |
+ i  l |
+ n  e |
+ g  x |                           require more uniformity,
+    i |                           interop testing is easier,
+    t |                           but writing correct server
+    y |                           requires more effort
+      +------------------------------------------------------
+         > increasing server complexity
+</p>

diff --git a/2019-kvm-forum/notes-08-resize b/2019-kvm-forum/notes-08-resize
index c30ef81..85c08ae 100644 (file)
--- a/2019-kvm-forum/notes-08-resize
+++ b/2019-kvm-forum/notes-08-resize
@@ -3,7 +3,7 @@ Where to go from here: Adding resize to NBD
 
 - based somewhat on https://lists.debian.org/nbd/2017/01/msg00016.html
 
-* Heading: Bigger is better?
+* Heading: Resize: where getting bigger is better
 - 8000- slide
   - qemu -> (raw) -> qemu-nbd -> (qcow2) -> image.qcow2
   - qemu -> (qcow2) -> qemu-nbd -> (raw) -> image.qcow2