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    SubjectRe: wishful thinking about atomic, multi-sector or full MD stripe width, writes in storage
    Ric Wheeler wrote:
    > On 09/04/2009 05:21 PM, Mark Lord wrote:
    ..
    >> How about instead, *fixing* the MD layer to properly support barriers?
    >> That would be far more useful, productive, and better for end-users.
    ..
    > Fixing MD would be great - not sure that it would end up still faster
    > (look at md1 devices with working barriers with compared to md1 with
    > write cache disabled).
    ..

    There's no inherent reason for it to be slower, except possibly
    drives with b0rked FUA support.

    So the first step is to fix MD to pass barriers to the LLDs
    for most/all RAID types.

    Then, if it has performance issues, those can be addressed
    by more application of little grey cells. :)

    Cheers


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