On 10/17/2016 12:20 PM, James Bottomley wrote:
We really need to have some ways to validate that our IO stack is
>properly and safely configured.
>I would love to see a couple of things:
>* having T10 & T13 report the existence of a volatile write cache -
>this is different than WCE set, some devices have a write cache and
>are battery/flash backed.
That's the non-volatile cache log page.


That is not how the vendors implement this unfortunately. I dug into this non-volatile cache log page with several disk vendors last year and they were consistently not setting this to reflect that state.


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