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    SubjectRe: Integration of SCST in the mainstream Linux kernel


    On Mon, 4 Feb 2008, Matt Mackall wrote:
    >
    > But ATAoE is boring because it's not IP. Which means no routing,
    > firewalls, tunnels, congestion control, etc.

    The thing is, that's often an advantage. Not just for performance.

    > NBD and iSCSI (for all its hideous growths) can take advantage of these
    > things.

    .. and all this could equally well be done by a simple bridging protocol
    (completely independently of any AoE code).

    The thing is, iSCSI does things at the wrong level. It *forces* people to
    use the complex protocols, when it's a known that a lot of people don't
    want it.

    Which is why these AoE and FCoE things keep popping up.

    It's easy to bridge ethernet and add a new layer on top of AoE if you need
    it. In comparison, it's *impossible* to remove an unnecessary layer from
    iSCSI.

    This is why "simple and low-level is good". It's always possible to build
    on top of low-level protocols, while it's generally never possible to
    simplify overly complex ones.

    Linus


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