Clear DefinitionsDisk Array
1 min read
Pronunciation
[disk uh-rey]
Analogy
Like a bookshelf with multiple shelves: if one shelf breaks, others still hold your books safely.
Definition
A storage system that combines multiple disk drives into a single logical unit for redundancy, performance, and capacity (e.g., RAID configurations).
Key Points Intro
Disk arrays enhance storage reliability and throughput via drive pooling.
Key Points
Redundancy: RAID levels (0,1,5,6,10) protect against drive failures.
Performance: Parallel reads/writes across disks increase I/O.
Scalability: Add drives to expand capacity.
Management: Controllers handle striping, parity, and rebuilds.
Example
A blockchain archive node uses a RAID‑6 disk array to store the full ledger with double parity tolerance for two simultaneous disk failures.
Technical Deep Dive
RAID controller presents LUN to OS; data is striped with block-level parity. On failure, rebuild uses surviving disks’ parity to reconstruct data. Monitoring uses SMART and SNMP alerts.
Security Warning
Array controller failure can render data inaccessible; maintain backups and spare drives.
Caveat
RAID is not a backup; it protects against hardware failure but not data corruption or deletion.
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