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pythonlibvirtvirsh
PatrickF
PatrickF

Reputation: 31

Libvirt API for python - blockCopy issue

Using virsh, I can use the following cli command to move an active disk to another location:

virsh blockcopy --domain 'mydomain' vda /my_new_path/disk.qcow2 --wait --verbose --pivot

However when I try to do the same with the libvirt api:

source = 'vda'
dest_xml = """
<disk>
    <destination type='file'>/my_new_path/disk.qcow2</destination>
    <format type='qcow2'/>
</disk>
"""

domain.blockCopy(source, dest_xml, {}, flags=0)

I get the following error: libvirt.libvirtError: missing source information for device. I've tried setting the source as vda, or the full path to the source file - no luck.

Has anyone out there solved this problem? What does the source value need to be?

Upvotes: 0

Views: 83

Answers (1)

PatrickF
PatrickF

Reputation: 31

My mistake. a bit confusingly, the destination block device path needs to be labelled as "source", in the xml snippet, thus:

<disk>
    <destination type='file'>/my_new_path/disk.qcow2</destination>
    <format type='qcow2'/>
</disk>

should be:

<disk>
    <source type='file'>/my_new_path/disk.qcow2</destination>
    <format type='qcow2'/>
</disk>

Of course this makes sense. Everything now works - I can live now migrate a virtual disk to a different path.

Hopefully people will find this answer helpful. /p

Upvotes: 0

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