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(also RAID 5+1)

RAID 51 definition

RAID 51 is a hybrid RAID configuration that combines the features of RAID 5 and RAID 1. With data striped across multiple disks and parity information distributed among the disks — as in RAID 5 — this configuration provides improved read performance and efficient storage utilization. Moreover, by mirroring the entire array onto another set of disks, RAID 51 offers performance data protection and redundancy of RAID 1.

See also: NAS, fault tolerance, data center storage, hot spare

Where is RAID 51 used?

  • Enterprise data centers. In large enterprise environments where data integrity and uptime are crucial, RAID 51 offers a compelling balance of redundancy, performance, and data protection.
  • Critical database servers. For database servers that require high availability and fast recovery from disk failures, RAID 51 can be an effective solution.
  • High-availability systems. Systems that cannot afford significant downtime, such as those used in financial institutions, healthcare systems, and other critical infrastructure, often use RAID 51.
  • Network-attached storage (NAS) systems. In large NAS systems where data loss would be particularly problematic, RAID 51 provides an extra layer of data protection.
  • Backup and disaster recovery. RAID 51 offers a good balance between performance and redundancy for backup servers and disaster recovery systems, ensuring data is safe and quickly recoverable.