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Re: [Qemu-devel] [PATCH 9/9] block-migration: add named dirty bitmaps mi
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From: |
Paolo Bonzini |
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Subject: |
Re: [Qemu-devel] [PATCH 9/9] block-migration: add named dirty bitmaps migration |
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Date: |
Mon, 12 Jan 2015 20:09:27 +0100 |
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User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.3.0 |
On 12/01/2015 18:31, John Snow wrote:
>> How do you track which parts of the disk have been acted upon (e.g.
>> mirrored in the case of the drive-mirror command), so that they have
>> become 0?
>
> Hm... so your question here is, "What happens if the named bitmap you
> are transferring gets reset to 0 during migration? Will anybody track
> this change?"
>
> As far as I know, the only "consumer" of _named_ BdrvDirtyBitmaps is
> block/backup.c, and we do not support it for mirror (yet?)
Right.
> So can a block-backup job be running WHILE we migrate?
I think so.
Paolo