RAID Calculator
Work out usable capacity, fault tolerance and efficiency for RAID 0, 1, 5, 6, 10, 50, 60 and JBOD before you choose your drives. Figures are estimates; real arrays lose a little capacity to formatting and metadata.
Which RAID level should I choose?
RAID 0 stripes data for speed with no protection. RAID 1 mirrors two drives. RAID 5 survives one drive failure, a balanced choice for NAS and file servers. RAID 6 survives two failures and suits large-capacity drives. RAID 10 combines mirroring and striping for databases and virtualization. RAID 50/60 span multiple RAID 5/6 groups in big arrays. RAID is not a backup: keep a separate copy of important data.
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