Rotated Pros: Pros: Pros: Pros: Parity or Balanced Single loss Single loss Only one Parity Disks load survivable; does not more disk to (RAID 5) Potential for active write prevent power better read requests access response might still times, become throughput, corrupted One and additional concurrency disk required. Three-disk Cons: Cons: Cons: Cons: minimum Up to 75% Multiple Multiple Up to four write losses affect losses times the performance entire prevent power for reduction After a single access to write requests because of loss, array is entire array (excluding the vulnerable To idle power) until Decreased reconstructed application read access might performance be slowed or in failure stopped mode All sectors must be read for potential major slowdown Danger of data in invalid state after power loss and recovery if not carefully implemented
Rotated Parity or Parity Disks (RAID 5) One additional disk required. Three-disk minimum Pros: Balanced load Potential for better read response times, throughput, and concurrency Cons: Up to 75% write performance reduction because of Decreased read performance in failure mode All sectors must be read for potential major slowdown Danger of data in invalid state after power loss and recovery if not carefully implemented Pros: Single loss survivable; active write requests might still become corrupted Cons: Multiple losses affect entire After a single loss, array is vulnerable until reconstructed Pros: Single loss does not prevent access Cons: Multiple losses prevent access to entire array To application access might be slowed or stopped Pros: Only one more disk to power Cons: Up to four times the power for write requests (excluding the idle power)
performance-tuning-guidelines-windows-server-2012.docx