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I understand what RAID10 (2+2) is (stripped mirror) whereby there are data are striped across 2 groups and each group have a pair of mirror devices (2 disks).

This is how i have understand "2+2"

For RAID10 4+4, is it

  1. striping across 4 groups, each group still having 2 mirrored devices or
  2. striping across 2 groups, each group have 4 mirrored devices
  3. striping across 4 groups, each group have 4 mirrored devices

2 and 3 just doesn't make sense.

How is 1) a 4+4 then ?

Regards, Noob

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An 8 (4+4) disks RAID 10 setup is striped across 4 groups of 2-way mirrored device. In other words, it has significantly higher performance but sligtly lower relibility (due to increased disk count) than 4-disk RAID 10.

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