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Debian has a [FAQ] on Linux raid. Some comments:

Answer 4b: The FAQ says that for a 4-disk raid10 array, you can survive two disk failures in half of the cases. The real figure is that in 2/3 of the cases you can survive.

Answer 6: The raid10 layout actually makes sense with only 2 disks, the FAQ says 3 disks are needed. Also "somewhat improved performance" is not adequeate, raid10,f2 offers something like twice the performance of normal RAID1+0 for sequential reading.

The FAQ references which actually does not refer to current Linux kernel raid10 technology, but to RAID1+0 versus RAID0+1 nested raid layout.

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