RAID Storage Calculator
RAID Configuration
Calculate usable storage for a RAID configuration
Formula
RAID 0: Usable = N x Disk | RAID 1: Usable = Disk | RAID 5: Usable = (N-1) x Disk | RAID 6: Usable = (N-2) x Disk | RAID 10: Usable = (N/2) x Disk
Frequently Asked Questions
Which RAID level should I choose?
RAID 1 for OS/boot drives (simple mirroring). RAID 5 for file servers with 3-8 disks (good capacity/redundancy balance). RAID 6 for large arrays with big disks (survives 2 failures during rebuild). RAID 10 for databases and high-performance workloads. RAID 0 only for scratch/temporary data where loss is acceptable.
What happens when a RAID disk fails?
In RAID 1/5/6/10, the array continues operating in a degraded state. Performance may drop, especially writes. You must replace the failed disk and rebuild the array. During rebuild (which can take hours to days), RAID 5 is vulnerable since another failure means data loss -- RAID 6 protects against this.
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