Choice Of RAID Level

Factors

• Cost
• Performance
• Performance during failure
• Performance during rebuild of failed disk

Level 1 vs. 5

• Level 1 has better write speed
• Level 1 has higher storage cost
• Level 5 is preferrable for massive applications

Level 6 vs. 5

• Level 6 is better than 5 because it can tolerate two disk failures, but takes more budget