Re: [Qemu-discuss] One question about "drive-backup"

[Fam Zheng]

On Wed, 08/22 22:20, David Lee wrote:
> Hi, list
> 
> I was trying "drive-backup" for incremental backups, and so far so
> good for individual drives.
> The question is that, when I grouped the drive-backup into a
> transaction, I got errors like:
> 
> {"id":"libvirt-377183","error":{"class":"GenericError","desc":"a
> sync_bitmap was provided to backup_run, but received an incompatible
> sync_mode (top)"}}
> 
> It is also the case when sync mode is changed to 'full'.  And the only
> valid mode seems to be
> 'incremental', which is exactly what's documented in:
>   
> https://github.com/qemu/qemu/blob/master/docs/interop/bitmaps.rst#partial-transactional-failures
> 
> But, there are no warnings saying that only 'incremental' sync mode
> can be grouped into a transaction.
> 
> Any suggestion on taking multiple drive-backups without sync mode =
> 'incremental'?

Drop the 'bitmap' parameters if you're not doing incremental backup?

Fam

> 
> Thanks in advance.
> 
> 
> PS. here is the snippet of my QMP command:
> ----cut begin----
> {
>  "execute": "transaction",
>  "arguments": {
>    "actions": [
>      {
>        "type": "drive-backup",
>        "data": {
>          "device": "drive-virtio-disk0",
>          "target": "/opt/backups/82faf05a-2cad-43a7-b9d6-9c78075534fe.qcow2",
>          "bitmap": "bitmap0",
>          "job-id": "job-516",
>          "sync": "top",
>          "format": "qcow2"
>        }
>      },
>      {
>        "type": "drive-backup",
>        "data": {
>          "device": "drive-scsi0-0-0-1",
>          "target": "/opt/backups/6ee3e2d4-6e40-49d5-b15f-ff20c0aafbee.qcow2",
>          "bitmap": "bitmap1",
>          "job-id": "job-517",
>          "sync": "top",
>          "format": "qcow2"
>        }
>      }
>    ],
> }
> ----cut ends----
> 
> -- 
> Thanks,
> Li Qun
>