virsh backup-begin problem

[Andrey Fokin]

Thanks Peter!
But is possible change XML configuration towards will be possible to do
full (push) backup?

On Wed, Jan 20, 2021 at 9:08 PM Peter Krempa <pkrempa at redhat.com> wrote:

> On Wed, Jan 20, 2021 at 20:49:49 +0300, Andrey Fokin wrote:
> > Colleagues, could you please advise what a problem could be in XML file
> in
> > case of:
> > virsh backup-begin lubuntu2 ./backup.xml
> >
> > where backup.xml -
> > <domainbackup>
> >     <disk name='/var/lib/libvirt/images/lubuntu2.qcow2' type='file'>
> >     <target file='$PWD/scratch1.img'/>
> >     <driver type='raw'/>
> >     </disk>
> >     <disk name='/var/lib/libvirt/images/lubuntu2-1.qcow2' type='file'>
> >       <target file='$PWD/scratch2.img'/>
> >       <driver type='raw'/>
> >     </disk>
> > </domainbackup>
>
> snip ...
>
> You forgot to add what you are observing, but I presume:
>
> 'operation unsupported: incremental backup is not supported yet'
>
> Unfortunately it's what it says on the tin. The implementation of the
> incremental backup code is not finished yet, thus the feature is
> disabled.
>
> If you want to test-drive incremental backup APIs, you can enable the
> experimental feature by using the XML documented in:
>
> https://libvirt.org/drvqemu.html#xmlnsfeatures
>
> to enable a feature named 'incremental-backup'. Please make sure to read
> the caveats of doing so thoroughly.
>
> I also advise not to combine incremental backups with snapshots
> (virDomainSnapshot* APIs) and blockjobs (virDomainBlock* APIs) as that
> will not work properly without a patch enabling also experimental qemu
> features.
>
> I also suggest you use the latest qemu for this.
>
>

-- 
BRG,
      Andrey
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