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[Bug 1070762] Re: savevm fails with inserted CD, "Device '%s' is writabl
From: |
John Snow |
Subject: |
[Bug 1070762] Re: savevm fails with inserted CD, "Device '%s' is writable but does not support snapshots." |
Date: |
Tue, 28 Jul 2020 01:34:52 -0000 |
Very old bug. If anyone sees this behavior, please re-file against a
supported release (5.0 at time of writing, soon to be 5.1) and please
paste a full command-line and steps to reproduce.
(To my knowledge, this bug is not present in modern QEMU builds, but do
not know when it would have changed.)
--js
** Changed in: qemu
Status: New => Incomplete
** Changed in: qemu
Assignee: John Snow (jnsnow) => (unassigned)
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https://bugs.launchpad.net/bugs/1070762
Title:
savevm fails with inserted CD, "Device '%s' is writable but does not
support snapshots."
Status in QEMU:
Incomplete
Bug description:
Hi,
yesterday unfortunately a customer reported a failed snapshot of his
VM. Going through the logfile I discovered:
"Device 'ide1-cd0' is writable but does not support snapshots"
this is with qemu-1.2.0 and 1.0.1 at least...
Why writeable?
Even if I specify "-drive ...,readonly=on,snapshot=off" to qemu the
monitor-command sees the CD-ROM-device as being writeable?!
Somewhere I saw a "hint" for blockdev.c:
=== snip ===
--- /tmp/blockdev.c 2012-10-24 11:37:10.000000000 +0200
+++ blockdev.c 2012-10-24 11:37:17.000000000 +0200
@@ -551,6 +551,7 @@
case IF_XEN:
case IF_NONE:
dinfo->media_cd = media == MEDIA_CDROM;
+ dinfo->bdrv->read_only = 1;
break;
case IF_SD:
case IF_FLOPPY:
=== snap ===
after installing with this small patch applied it works, so insert CD, savevm
<somename> succeeds.
This should be fixed at all correct places, and the tags
"readonly=on,snapshot=off" should do it, too. Or even just work after
specifying a drive being a CD-rom should do the trick ;-)
Another "bad habit" is, that the ISO/DVD-file has to be writeable to
be changed?
Thnx for attention and regards,
Oliver.
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