Both configurations are probably possible but using the first seems riskier.  

The first situation leaves you with, depending on implementation in the controller, possibly a longer rebuild (it may have to read all three drives of the stripe to rebuild the mirror made of three drives) as well as if you lose a drive out of each stripe set the array fails.

The second provides faster rebuild (only rebuild a single drive to its mirror) as well as better protection 1 drive of each mirror can fail before the array is no longer available.

6 Disk Raid 1+0
Suppose I have a string 04032010.
I want it to be 04/03/2010. How would I insert the slashes with a regex?
