[sheepdog] [PATCH 0/2] add cache options 'page' and 'unsafe'

Liu Yuan namei.unix at gmail.com
Mon Oct 22 08:36:39 CEST 2012

On 10/22/2012 02:26 PM, MORITA Kazutaka wrote:
>> > If disk is failed, I don't think buffered read/write will succeed
>> > because we will fail to open the fd. So your rationale about unsafe
>> > seems useless: no one will actually use it.
> Actually we NTT would use it.  We have data centers which can supply
> reliable power and we can regard that, if data is replicated to
> multiple memories, the data is safe.  If disk is failed with 'unsafe'
> mode, the node will be completely replaced with a new machine and
> there is no risk of reading invalid data.

So this kind of machine is smart and fail-over is taken behind the
scene, sounds interesting.

If there is actual users, I am not against adding it. But 'unsafe' looks
a little bit vague, call it as backend:nosync looks more straight
forward to what it really means.


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