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Documentation: Warn against qemu-img on active image

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People have repeatedly expected that you can do things like snapshotting
an image with qemu-img while a qemu instance is running. Maybe we need
to consider locking the files while they are in use, but having a
warning in the qemu-img manpage is doable for 1.2 and can't hurt anyway.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Kevin Wolf 2012-08-16 10:56:35 +02:00
parent 65bd155c73
commit 48467328c6
1 changed files with 10 additions and 0 deletions
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qemu-img.texi
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@ -4,6 +4,16 @@ usage: qemu-img command [command options]
@c man end @c man end
@end example @end example
@c man begin DESCRIPTION
qemu-img allows you to create, convert and modify images offline. It can handle
all image formats supported by QEMU.
@b{Warning:} Never use qemu-img to modify images in use by a running virtual
machine or any other process; this may destroy the image. Also, be aware that
querying an image that is being modified by another process may encounter
inconsistent state.
@c man end
@c man begin OPTIONS @c man begin OPTIONS
The following commands are supported: The following commands are supported: