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With RAID 10 you are guaranteed to be able to survive a single disk failure. After that you are playing Russian roulette. Basically R10 is a strip of mirrors. So you can lose a single disk in each mirror and be ok, once you lose both disks in a single underlying mirror the strip dies. So the fault tolerance on a R10 array is 1, but you can lose UP TO 50% ...


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I have moved my raid1 to raid10 now and while this page helped me but there are some things missing in the answers above. Especially my aim was to keep ext4 birthtimes. the setup was: 2 raid1 disks of each type msdos and md0 with ext4 partition and mbr with msdos 2 fresh new disks becoming the new primaries (all same size) resulting in an 4 disks ...



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