RAID Comparison Chart arrow
 RAID Level
Min Drives
Protection
Description
Strengths
Weaknesses
Typical Apps
 RAID 0
2
None
Data striping without redundancy
Highest performance
No data protection; One drive fails, all data is lost
High End Workstations, Data Logging, Real-Time Rendering, Transitory Data
 RAID 1
2
Single Drive Failure
Disk mirroring
Very high performance; Very high data protection; Very good on write performance
High redundancy cost overhead; Because all data is duplicated, twice the storage capacity is required
Operating Systems, Transactional Databases
 RAID 5
3
Single Drive Failure
Block-level data striping with distributed parity
Best cost/performance for transaction-oriented networks; Very high performance, very high data protection; Supports multiple simultaneous reads and writes; Can also be optimized for large, sequential requests
Write performance is slower than RAID 0 or RAID 1
Data Warehousing, Web, Archiving, Basic File Servers, Disk Backup
 RAID 6
4
2 Drive Failure
Same as RAID 5 with x2 Parity distributed across an extra drive
Offers Solid Performance with the additional fault tolerance of allowing availability to data if 2 disks in a RAID group to fail. Recommended to use more drives in RAID group to make up for performance and disk utilization hits compared to RAID 5
Must use a minimum of 5 drives with 2 of them used for parity so disk utilization is not as high as RAID 3/5. Performance is slightly lower than RAID 5
High Availability Solutions, Mission Critical Apps, Servers with Large Capacity Requirements
 RAID 10
4
1 Disk Per Mirrored Stripe (not same mirror)
Combination of RAID 0 (data striping) and RAID 1 (mirroring)
Highest performance, highest data protection (can tolerate multiple drive failures)
High redundancy cost overhead; Because all data is duplicated, twice the storage capacity is required; Requires minimum of four drives
Databases, Application Servers
 RAID 50
6
1 Disk Per Mirrored Stripe
Combination of RAID 0 (data striping) and RAID 5 (Single Parity Drive)
Highest performance, highest data protection (can tolerate multiple drive failures)
High redundancy cost overhead; Because all data is duplicated, twice the storage capacity is required; Requires minimum of four drives
Databases, File Servers, Application Servers,
 RAID 60
8
2 Disks Per Mirrored Stripe
Combination of RAID 0 (data striping) and RAID 6 (Dual Parity Drives)
Highest performance, highest data protection (can tolerate multiple drive failures)
High redundancy cost overhead; Because all data is duplicated, twice the storage capacity is required; Requires minimum of four drives
High Availability Solutions, Mission Critical Apps, Servers with Large Capacity Requirements