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+<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>Disk metadata</h1>
+
+<img src="3100-disk-metadata-1.svg"
+ width="80%"/>
+
+<pre>
+ls -lsh
+filefrag -v
+qemu-img map
+nbdinfo --map
+</pre>
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--- /dev/null
+<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>Sparsifying disk images</h1>
+
+<img src="3200-sparsification-1.svg"
+ width="80%"/>
+
+<br/>
+<br/>
+
+<pre>
+ioctl(fd, FITRIM, ...)
+fstrim
+virt-sparsify --in-place
+</pre>
--- /dev/null
+<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>Sparsifying into a snapshot</h1>
+
+<pre>
+┌───────────────┐ssh ┌────────────┐
+│ fedora-33.img │───▶│ qcow2 file │◀─── virt-sparsify --in-place
+└───────────────┘ └────────────┘ ┌───────────┐
+ ───▶ qemu-img convert ────▶│ local.img │
+ └───────────┘
+</pre>
--- /dev/null
+#!/bin/bash -
+
+source functions
+
+# Title.
+export title="Sparsification + copying"
+
+# History.
+remember 'qemu-img create -f qcow2 -F raw -b ssh://kool/mnt/scratch/pipes/fedora-33.img snapshot.qcow2'
+remember 'virt-sparsify --in-place snapshot.qcow2'
+remember 'qemu-img convert -f qcow2 snapshot.qcow2 -O raw local.img -p'
+
+terminal
needed by the operating system but also isn't zeroes.
-Meta-data
+Disk metadata
----------------------------------------------------------------------
DIAGRAM:
unset https_proxy
unset ftp_proxy
+# Don't use libvirt.
+export LIBGUESTFS_BACKEND=direct
+
+# Pre-cache libguestfs appliance.
+guestfish -a /dev/null run &
+
# Clean up after previous run.
talkdir=$PWD ./restore
git.annexia.org / libguestfs-talks.git / commitdiff
