Re: [PATCH] nvme: honor the volatile write cache enable state

[Keith Busch]

On Fri, Oct 16, 2026 at 07:43:24PM +0200, Erwan Velu wrote:
> This disk is configured by default with VWC_PRESENT enabled, but the
> Volatile Write Cache is disabled (NVME_FEAT_VWC_ENABLE=0), so the
> device has a Volatile Write Cache, but it's disabled.

...

> In this table, with my patch, I've enabled and disabled the volatile
> write cache using nvme set-feature -f 6; this only affects
> NVME_FEAT_VWC_ENABLE, and VWC_PRESENT is still reported as present.

...

> Hope that's make it more clear,

Unfortunately, no: there are contradicting statements here.