Re: [ceph-users] resume RBD mirror on another host

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On Thu, Jul 13, 2023 at 6:16 PM Tony Liu <tonyliu0592@xxxxxxxxxxx> wrote:
>
> Hi,
>
> How RBD mirror tracks mirroring process, on local storage?
> Say, RBD mirror is running on host-1, when host-1 goes down,
> start RBD mirror on host-2. In that case, is RBD mirror on host-2
> going to continue the mirroring?

Hi Tony,

No, it's tracked on the RBD image itself -- meaning in RADOS.

With journal-based mirroring it's the commit position in the journal
(roughly).

For snapshot-based mirroring, there is last_copied_object_number field
on each mirror snapshot.

Thanks,

                Ilya
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