Ibm V3700 SAN / Howto add additional disks in existing pool

We have IBM v3700 San Storage (300gb x 36 SAS HDD) connected to Four servers (windows 2008) via FC. Each server have few disks allocated in RAID5 mode.

There are 8 unused (candidate) disks available in the slots. We want to add 2 disks per server to EXPAND existing pools.

What are my best options? How can i add 2 disks to each server pool. I see it gives me few raid option like raid0,10,5 , Is this possible I simply add 2 disk to existing raid5 to get maximum space and raid failover could be covered by existing raid 5 spare?

Or what should i do ? please suggest.

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