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Re: [Qemu-devel] [PATCH 2/5] migration: Create block capability


From: Juan Quintela
Subject: Re: [Qemu-devel] [PATCH 2/5] migration: Create block capability
Date: Tue, 16 May 2017 19:37:47 +0200
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/25.2 (gnu/linux)

Eric Blake <address@hidden> wrote:
> On 05/16/2017 11:42 AM, Markus Armbruster wrote:
>
>>>> Well, to suggest something, I'd first have to figure out WTF incremental
>>>> block migration does.  Your text helps me some, but not enough.  What
>>>> exactly is being migrated, and what exactly is assumed to be shared
>>>> between source and destination?
>>>>
>>>> Block migration is scandalously underdocumented.
>>>
>
>> Can you draft a documentation comment for @block-incremental?
>
> How about:
>
> @block-incremental: Affects how much storage is migrated when the block
> migration capability is enabled.  When false, the entire storage backing
> chain is migrated into a flattened image at the destination; when true,
> only the active qcow2 layer is migrated and the destination must already
> have access to the same backing chain as was used on the source.
> (since 2.10)

Changed.  Thanks.



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