Re: [Qemu-devel] [PATCH] sheepdog: implement direct write semantics

[Liu Yuan]

On 01/08/2013 05:40 PM, Stefan Hajnoczi wrote:
> Otherwise use sheepdog writeback and let QEMU block.c decide when to
> flush.  Never use sheepdog writethrough because it's redundant here.

I don't get it. What do you mean by 'redundant'? If we use virtio &
sheepdog block driver, how can we specify writethrough mode for Sheepdog
cache? Here 'writethrough' means use a pure read cache, which doesn't
need flush at all.

Thanks,
Yuan