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Re: [Qemu-devel] [PATCH v3] mirror: Only mirror granularity-aligned chun
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From: |
Vladimir Sementsov-Ogievskiy |
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Subject: |
Re: [Qemu-devel] [PATCH v3] mirror: Only mirror granularity-aligned chunks |
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Date: |
Mon, 5 Aug 2019 15:52:11 +0000 |
05.08.2019 18:33, Max Reitz wrote:
> In write-blocking mode, all writes to the top node directly go to the
> target. We must only mirror chunks of data that are aligned to the
> job's granularity, because that is how the dirty bitmap works.
> Therefore, the request alignment for writes must be the job's
> granularity (in write-blocking mode).
>
> Unfortunately, this forces all reads and writes to have the same
> granularity (we only need this alignment for writes to the target, not
> the source), but that is something to be fixed another time.
>
> Cc: address@hidden
> Signed-off-by: Max Reitz <address@hidden>
Reviewed-by: Vladimir Sementsov-Ogievskiy <address@hidden>
--
Best regards,
Vladimir