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Pros and cons of software Parity-RAID (e.g. RAID5)

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I was recently told about some problems concerning Parity-RAIDs without a non-volatile cache. More exspensive HW-controllers do have battery-powered caches to finish write-operations in case of power failure. Now, some people say that such a failure, perhaps in combination with a degraded array, may kill your whole filesystem. Others claim that those issues are outdated […]