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    SubjectRe: MD/DM and barriers (was Re: [patch] ext2/3: document conditions when reliable operation is possible)
    Pavel Machek wrote:
    > On Thu 2009-08-27 12:54:05, Jeff Garzik wrote:
    >> Only md/raid1 supports barriers at present, it seems. None of the other
    >> MD drivers support barriers.
    > Not even md/raid0? Ouch :-(.

    Only for raid1 there's no requiriment for inter-drive ordering. Hence
    only raid1 supports barriers (and gained that support very recently,
    in 1 or 2 kernel releases). For the rest, including raid0 and linear,
    inter-drive ordering is necessary to implement barriers. Or md should
    have its own queue (flushing) mechanisms.


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