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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 ...


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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