To maximize response time and avoid a write penalty, small write operations are mapped into RAID 1 configurations, and {HEAD ~ medium and large write operations} are mapped into {TAIL ~ RAID} 3 configurations 
To maximize response time and avoid a write penalty , small write operations are mapped into RAID 1 configurations , and { HEAD ~ medium and large write operations } are mapped into { TAIL ~ RAID } 3 configurations
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 HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL OTH OTH