When a read or write request is received, adaptive RAID mapping data structures are used to map the blocks requested by the host into {HEAD ~ the blocks} managed by {TAIL ~ the transparent RAID} 
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When a read or write request is received , adaptive RAID mapping data structures are used to map the blocks requested by the host into { HEAD ~ the blocks } managed by { TAIL ~ the transparent RAID }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL