April 8, 201610 yr Just curious about the current implementation of dual parity in the current 6.2 beta. I understand how single parity works, but no clear on the dual parity setup. Lets say a single drive fails, its replaced and is rebuilding, then another drive fails, so it is also replaced and rebuilding of that drive begins too? Does this occur simultaneously? Are data rebuild (replacing a drive with a larger one) times the same or longer with dual parity? What happens with a parity drive fails in a dual parity setup?
April 8, 201610 yr Community Expert Lets say a single drive fails, its replaced and is rebuilding, then another drive fails, so it is also replaced and rebuilding of that drive begins too? 2nd failed disk would disable, you would have to cancel current rebuild, replace failed disk (or unassig and reassign same disk) and re-start array to rebuild both. Are data rebuild (replacing a drive with a larger one) times the same or longer with dual parity? Same, unless there's a controller bottleneck on the server, or you have a CPU limited parity check, dual parity needs a little more CPU power. What happens with a parity drive fails in a dual parity setup? Until you replace it you are only protected for a single disk failure.
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