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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