[Sheepdog] [PATCH] sheep: disable object cache by default

[Christoph Hellwig]

On Mon, May 07, 2012 at 10:53:31AM +0800, Liu Yuan wrote:
> On 05/07/2012 03:37 AM, MORITA Kazutaka wrote:
> 
> > Though it is important to support a write caching feature in Sheepdog,
> > I think we should disable it by default for now because there are
> > still some cache coherency problems which looks hard to solve:
> 
> 
> Disagree with the patch.
> 
> QEMU setup already disables object cache as default (writethrough mode).
> If users explicitly enables, he knows better than us to do such a policy.

cache=none is the defualt for any serious user of qemu.  I'd really
avoid automatically enabling a feature like the object cache which
seems to weaken the persistancy semantics, and doesn't even have proper
documentation.