* Merlin Moncure <mmoncure@xxxxxxxxx> [090831 10:38]: > I agree, that's good analysis. The main point I was making was that > if you have say a 10 disk raid 5, you don't involve 10 disks, only > two...a very common misconception. I made another mistake that you > didn't catch: you need to read *both* the data drive and the parity > drive before writing, not just the parity drive. > > I wonder if flash SSD are a better fit for raid 5 since the reads are > much cheaper than writes and there is no rotational latency. (also, > $/gb is different, and so are the failure cases). The other thing that scares me about raid-5 is the write-hole, and the possible delayed inconsistency that brings... Again, hopefully mitigated by a dependable controller w/ BBU... -- Aidan Van Dyk Create like a god, aidan@xxxxxxxxxxx command like a king, http://www.highrise.ca/ work like a slave.
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