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Re: [Qemu-devel] [PATCH] sheepdog: implement direct write semantics
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From: |
Liu Yuan |
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Subject: |
Re: [Qemu-devel] [PATCH] sheepdog: implement direct write semantics |
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Date: |
Tue, 25 Dec 2012 16:45:55 +0800 |
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User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/17.0 Thunderbird/17.0 |
On 12/25/2012 03:47 PM, MORITA Kazutaka wrote:
> I wonder if we should disable cache when cache=none. Many management
> frontend uses cache=none by default but, I think, users still expect
> that data is cached (e.g. by disk write cache when a raw format is
> used). cache=none only means that the host page cache is not used for
> VM disk IO.
>
> In that sense,
Well, I found setting cache=directsync will contain 'BDRV_O_CACHE_WB'.
Is this a bug for current master? If no, my current scheme will be the
only way to bypass cache of sheepdog.
Thanks,
Yuan