[Libguestfs] [PATCH] virt-resize: Document qcow2 output format (RHBZ#642826).
Richard W.M. Jones
rjones at redhat.com
Mon Oct 18 12:35:45 UTC 2010
--
Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
libguestfs lets you edit virtual machines. Supports shell scripting,
bindings from many languages. http://et.redhat.com/~rjones/libguestfs/
See what it can do: http://et.redhat.com/~rjones/libguestfs/recipes.html
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>From 4d88a74532b20bcb60909c0d0983cdf7498aa08c Mon Sep 17 00:00:00 2001
From: Richard W.M. Jones <rjones at redhat.com>
Date: Mon, 18 Oct 2010 13:35:06 +0100
Subject: [PATCH] virt-resize: Document qcow2 output format (RHBZ#642826).
---
tools/virt-resize | 25 +++++++++++++++++++++++++
1 files changed, 25 insertions(+), 0 deletions(-)
diff --git a/tools/virt-resize b/tools/virt-resize
index 0f0679e..2a6c406 100755
--- a/tools/virt-resize
+++ b/tools/virt-resize
@@ -78,6 +78,11 @@ remaining space to /dev/sda2:
virt-resize --resize /dev/sda1=+200M --expand /dev/sda2 olddisk newdisk
+As above, but the output format will be uncompressed qcow2:
+
+ qemu-img create -f qcow2 newdisk.qcow2 15G
+ virt-resize --expand /dev/sda2 olddisk newdisk.qcow2
+
=head1 DETAILED USAGE
=head2 EXPANDING A VIRTUAL MACHINE DISK
@@ -230,6 +235,25 @@ contents of a partition. Deleting a partition removes it completely,
but note that it also renumbers any partitions after the one which is
deleted, which can leave some guests unbootable.
+=head2 QCOW2 AND NON-SPARSE RAW FORMATS
+
+If the input disk is in qcow2 format, then you may prefer that the
+output is in qcow2 format as well. Alternately, virt-resize can
+convert the format on the fly. The output format is simply determined
+by the format of the empty output container that you provide. Thus to
+create qcow2 output, use:
+
+ qemu-img create [-c] -f qcow2 outdisk [size]
+
+instead of the truncate command (use C<-c> for a compressed disk).
+
+Similarly, to get non-sparse raw output use:
+
+ fallocate -l size outdisk
+
+(on older systems that don't have the L<fallocate(1)> command use
+C<dd if=/dev/zero of=outdisk bs=1M count=..>)
+
=head1 OPTIONS
=over 4
@@ -1418,6 +1442,7 @@ L<ntfsresize(8)>,
L<virsh(1)>,
L<parted(8)>,
L<truncate(1)>,
+L<fallocate(1)>,
L<Sys::Guestfs(3)>,
L<http://libguestfs.org/>.
--
1.7.3.1
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