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Calculate usable capacity, efficiency and disk fault tolerance for RAID 0, 1, 5, 6 and 10 with disk count, size and hot spares.
$ disks: N x capacity $ RAID 5 => (N-1) $ RAID 6 => (N-2) $ RAID 10 => N/2 $ RAID != backup
RAID capacity follows the level and disk count, but performance and protection also depend on disk type, controller, workload and rebuild time.
This tool produces a starting estimate for capacity planning; validate production decisions with load tests and real monitoring data.
Change the inputs and calculate again.
With equal disks: RAID 0 ≈ N×disk; RAID 1 one-disk capacity; RAID 5 (N−1)×disk; RAID 6 (N−2)×disk; RAID 10 roughly half.
A hot spare waits for rebuild and reduces total purchased-capacity efficiency.
Deletion, ransomware, corruption and site disaster still require independent backups.
Large disks can rebuild for a long time and stress surviving drives.
Three active disks.
Four active disks.
At least four and an even number of active disks.
Simple arrays are generally constrained by the smallest disk; implementation details vary.
Share your workload, traffic profile and growth target so we can determine the appropriate VPS or GPU server class.
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