RAID Calculator
RAID Calculator – Calculate RAID Storage Capacity and Redundancy
Planning a RAID configuration without knowing the actual usable capacity can lead to poor performance, wasted disks, or unexpected storage limitations. This RAID calculator helps you quickly calculate usable storage, redundancy, and disk efficiency for common RAID levels used in servers, NAS, and SAN environments.
Whether you are a system administrator, DevOps engineer, or database administrator, accurate RAID capacity calculation is essential before deploying production workloads.
RAID Level Information
Data is split across all drives. Maximum performance and capacity, but no redundancy.
- Minimum drives: 2
- Fault tolerance: None
- Capacity: 100%
Data is duplicated across all drives. Maximum redundancy.
- Minimum drives: 2
- Fault tolerance: n-1 drives
- Capacity: 1 drive worth
Data and parity distributed across all drives. Good balance of performance, capacity, and redundancy.
- Minimum drives: 3
- Fault tolerance: 1 drive
- Capacity: (n-1) drives
Similar to RAID 5 but with two parity blocks. Can survive two drive failures.
- Minimum drives: 4
- Fault tolerance: 2 drives
- Capacity: (n-2) drives
Combines mirroring and striping. Excellent performance and redundancy.
- Minimum drives: 4 (even number)
- Fault tolerance: 1 drive per mirror pair
- Capacity: 50%
