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Converting a RAID5 to RAID 0+1

We have a ML350 G3 with a Smart Array 642-Controller and 3 x 36GB HDD in a RAID 5.
My plan is to add 3 more disks and change the array to RAID 0+1.

Is this possible and if so what's the correct procedure for that ??
What stripe size is recommended for that. It's 16k at the moment.
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Thanks for your reply.

I already upgraded the drivers and ACU software.
But when I started it I was only offered to convert to RAID 0.
I thought I probably had to do it in two steps. First to 0 and after that to 0+1.

So, I only have to add the disks to my array and then the ACU will let me convert it
directly to 0+1 because of those extra disks, right ?!
Can I change the stripe size from 16k to 64k together with the RAID conversion
or should I do this in an extra step afterwards ?
Until a disk is physically added the ACU and added to the array it does not show the option to migrate to RAID 10, (or extend). It's quite annoying; I wish they would show the option but greyed out so you could click on it and it would tell you what was needed to enable the featiure.
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yes, this would be less confusing.
Thanks for your help