On Wed, 28 Sep 2005 00:12:33 PDT, [email protected] said: > Just a quick question: How can a user-mode application ensure that an > AIO write on a raw block device (i.e. open()ed with O_DIRECT) has > really -really- been written to the disk and not residing in an on-disk > write cache where it could be lost in case of a power failure? Step 1: Make sure you buy disk drives that don't lie through their teeth regarding details such as "is the write cache enabled?" or "did the flush cache work?". Such hardware can generate vast amounts of bad karma.... Step 2: Buy a UPS. A good one. You can't lose the cache during a power failure that doesn't actually hit. Step 3: http://catb.org/~esr/jargon/html/M/molly-guard.html - You want these. Lots of them.
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