On 24/05/15 20:41, Wols Lists wrote:
aiui raid won't help you at all here, will it?
Of course it will.
Firstly, if you get write failures, the hard drive should swap the block, or the write layer should swap it. Nothing to do with raid whatsoever.
Yep..
And if you get read errors, well, aiui, raid won't help here either - especially with mirrored raid, you just get a read failure. Raid does NOT give you error recovery unless the drive physically fails, and if it's a bad block it gets fixed at the disk or disk driver level - well below the raid driver.
Nope. If you get a read failure it will try and pull from another mirror, and *that* will succeed. Drives don't return dud* data. They either succeed or fail.
* Of course I've heard anecdotes from people about that happening, but it's not supposed to happen under *any* circumstances.
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