How to find pairs in a Raid 1+0 Array E200i ?

Hi

I have a problem here with my raid 1+0 array
i have 4 harddrives in bay 1-4 of Hp Pro laint ML350 G5 with e200i controller

when i have set up the array i choose the 4 drives and set them to raid 1+0

now i want to change 2 disks
one of 1st pair and one of 2nd pair but i cant find witch 2 drives are a pair

can anyone tell me how to look for the pairs?

i have tested all HP tools now but can`t find this information

sorry for the bad english

and thake you very much