Sorry, i'm not too good in English Language.
a) first stripe and mirror after stripe (01) or
b) first mirror and stripe after mirror (10)?
x= a mirror b
y = c mirror d
10 = x stripe y
x= a stripe b
y= c stripe d
01 = x mirror y
what system on the controller?
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The link below explains the differences between the two specific RAIDs:
RAID 10 "1+0" is a bit better. Since it's a bit more fault tolerance
The RAID you have, first striped all hard drives and then created a mirrored.
The main difference is the fault tolerance level. On a RAID 10, fault tolerance is more, creating the mirror after the striped, will allow you to back up all the information. If a disk fails you will be able to boot up and replace the disk and rebuilt the RAID