Internal implementation details aside, from the user PoV it is a *very*
serious issue. If -snapshot can't be applied automatically, maybe qemu
should warn or better fail if -snapshot is used together with -blockdev.
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this answers the whole question. Thanks a lot. closing
** Changed in: qemu
Status: New => Invalid
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https://bugs.launchpad.net/bugs/1860759
Title:
[REGRESSION] option `-snapsho
Hi,
The technical difference is that -blockdev requires you (the user or
management software) to create all block graph nodes explicitly. -drive
snapshot=on implicitly creates a qcow2 node above the actual disk image
(and that node points to a temporary image in /tmp). So because it’s
implicit a
Thank a lot for the detailed answer. Surely it's worth discussing qemu here
leaving libvirt for RH bugzilla.
> But since modern qemu has declared -snapshot to be unsupported with
-blockdev, and modern libvirt has switched to -blockdev, I claim that this
is not a qemu bug, but a libvirt feature req
On 1/24/20 4:41 AM, Ildar wrote:
Max, thanks a lot for the explanation.
Do you mean that snapshot-ing isn't possible totally for blockdev? Then I
guess some libvirt users are in trouble :((
Actually I didn't quite caught the reason why a blockdev supports backing
but not {backing to a file on /tm
Max, thanks a lot for the explanation.
Do you mean that snapshot-ing isn't possible totally for blockdev? Then I
guess some libvirt users are in trouble :((
Actually I didn't quite caught the reason why a blockdev supports backing
but not {backing to a file on /tmp then promptly deleted} ? What's t
Hi,
I don’t know much about libvirt, but I would have thought that any
manual modification of the qemu command line isn’t supported and might
always break.
Anyway, from a QEMU POV, -snapshot only works with -drive (this includes
-hda, etc.). It doesn’t work with -blockdev. I can see that this i
JFYI, I know that snapshot=on option should be used. But `-snapshot` option
exists and must work.
Also libvirt doesn't yet support it:
https://bugzilla.redhat.com/show_bug.cgi?id=508662
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