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On 09/13/2013 03:47 PM, Peter Humphrey wrote: |
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> On Friday 13 Sep 2013 14:47:35 Grant wrote: |
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> |
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>> Would the hot spare be in case I lose 2 drives at once? Isn't that |
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>> extraordinarily unlikely? |
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> |
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> Not really. One fails and you don't notice for a while, or it takes a while to |
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> recover from it. Then a second one fails. You're up queer street. |
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> |
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I like to do RAID6 now because I've been burned by this. The hot spare |
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did work and automatically start rebuilding, but another drive failed |
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during the rebuild process. Not that RAID6 will help if three drives |
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fail, but hey. |
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Another thing I've read is that firmware bugs on SSDs can wipe out a |
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whole array. I suspect it is when the raid has all the same |
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manufacturer/model in it and a bug appears on multiple drives killing |
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the array. I can't remember the details but I do believe the rebuild |
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procedure causing lots of writes and the drives bug out because of all |
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the writes. I'll admit this is not something that I've directly seen but |
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you may want to consider it, maybe even having 2 sets of 2 different |
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models in the array. My google-fu is failing me, I can't find that |
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article where I read this. |
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Dan |
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