不同 RAID 的 Write IO penalty
| RAID | IO penalty |
| 1 | 2 |
| 5 | 4 |
| 6 | 6 |
| 10 | 2 |
資料來源：Understanding RAID Penalty
IOPS（1/(seek+latency)=IOPS）
| Device | IOPS |
| 7,200 rpm SATA drives | 75 – 100 IOPS |
| 10,000 rpm SATA drives | 125 – 150 IOPS |
| 10,000 rpm SAS drives | 140 IOPS |
| 15,000 rpm SAS drives | 175 – 210 IOPS |
資料來源：IOPS
