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

[Eric Blake]

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)

-- 
Eric Blake, Principal Software Engineer
Red Hat, Inc.           +1-919-301-3266
Virtualization:  qemu.org | libvirt.org

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