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    SubjectRe: Disk write cache
    Date
    On May 15, 2005, at 12:43:07, Jeff Garzik wrote:
    > The only way to you can be assured that your data has "hit the
    > platter" is
    > (1) issuing [FLUSH|SYNC] CACHE, or
    > (2) using FUA-style disk commands

    And even then, some battery-backed RAID controllers will completely
    ignore cache-flushes, because in the event of a power failure they
    can maintain the cached data for anywhere from a couple days to a
    month or two, depending on the quality of the card and the size of
    its battery.

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