Invalidating The Linux Buffer Cache    Wednesday, January 10 2007 @ 01:39 PM EST Contributed by: sde When you write data, it doesn't necessarily get written to disk right then. The kernel maintains caches of many things, and disk data is something where a lot of work is done to keep everything fast and efficient. That's great for performance, but sometimes you want to know that data really has gotten to the disk drive. This could be because you want to test the performance of the drive, but could also be when you suspect a drive is malfunctioning: if you just write and read back, you'll be reading from cache, not from actual disk platters. So how can you be sure you are reading data from the disk? The answer actually gets a little complicated, particularly if you are testing for integrity, so bear with me. Read more   [ Views: 1334 ]

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