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Due to how Linux raid behaves, using a three way raid1 vs a two way+hot spare raid1 setup gives: slightly lower random write performance, because arrays's access latency (seek time+rotational delay) is the worst of the the disks composing the array significantly better random read performance, as Linux raid is capable of issuing multiple, independent reads ...


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Looks like you did an mdadm --create on "Creation Time : Thu Jun 11 23:21:12 2015", that could be a problem if you used the wrong parameters. What command line did you use? Also when the mount fails what is reported by... dmesg | tail And it's a good idea to check the SMART data on the drives to see if they are healthy. Don't despair. I often work on ...



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