[pve-devel] [PATCH qemu-server, container 0/2] avoid migrating disk images multiple times

Aaron Lauterer a.lauterer at proxmox.com
Tue May 2 15:17:30 CEST 2023

This small patch series adds additional checks for VMs and CTs to avoid
migrating local disk images multiple times.

The idea on how to reference them is similar as in the check if a disk
should be added as unusedX [0].

For example, if there are multiple storage definitions pointing to the
same actual storage, we can see the same image multiple times. These are

If we notice that a disk image is configured multiple times in the
config for the guest, we fail the migration with a warning.

One thing I am not really sure, is the case where a disk image is
currently configured fully and a second time as unusedX.

At least the Qemu part won't let us remove it as it is still in use.

But this is still a somewhat hypothetical example because in my tests, once
we detach a double configured disk image (e.g. scsi0 and scsi1), it will
not be added as unused0 but just disappear.
So there should not be a reasonable way to end up with a unused disk
config pointing to the same image as a configured one.

[0] https://git.proxmox.com/?p=qemu-server.git;a=blob;f=PVE/QemuServer.pm;h=c1d0fd2d06a35bd8d996a59b44eb60345165f1b6;hb=HEAD#l6910

qemu-server: Aaron Lauterer (1):
  migration: avoid migrating disk images multiple times

 PVE/QemuMigrate.pm | 33 +++++++++++++++++++++++++++++++++
 1 file changed, 33 insertions(+)

pve-container: Aaron Lauterer (1):
  migration: avoid migrating volume images multiple times

 src/PVE/LXC/Migrate.pm | 31 +++++++++++++++++++++++++++++++
 1 file changed, 31 insertions(+)


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