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    SubjectRe: [Nbd] [RESEND][PATCH 0/5] nbd improvements
    On Thu, Sep 15, 2016 at 02:01:59PM +0200, Wouter Verhelst wrote:
    > Yes. There was some discussion on that part, and we decided that setting
    > the flag doesn't hurt, but the spec also clarifies that using it on READ
    > does nothing, semantically.
    >
    >
    > The problem is that there are clients in the wild which do set it on
    > READ, so it's just a matter of "be liberal in what you accept".

    Note that FUA on READ in SCSI and NVMe does have a meaning - it
    requires you to bypass any sort of cache on the target. I think it's an
    wrong defintion because it mandates implementation details that aren't
    observable by the initiator, but it's still the spec wording and nbd
    diverges from it. That's not nessecarily a bad thing, but a caveat to
    look out for.

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