RAID and File Storage
📘 DBMS
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📅 Nov 14, 2025
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RAID and File Storage for Databases
RAID (Redundant Array of Independent Disks) is a technique that combines multiple physical disks into a single logical unit to improve performance and/or reliability.
Common RAID Levels
- RAID 0 (Striping): Improves performance by splitting data across disks. No redundancy.
- RAID 1 (Mirroring): Duplicates data on two disks for redundancy.
- RAID 5 (Striping with parity): Balanced read performance and fault tolerance.
- RAID 10 (1+0): Combines mirroring and striping for high performance and redundancy.
File Storage Considerations
- Choose RAID level based on read/write patterns and availability requirements.
- Use fast storage (SSD/NVMe) for transaction logs and high I/O tables.
- Separate data, indexes, and logs on different volumes when possible.
Best Practices
- Plan backups and recovery alongside RAID design — RAID is not a substitute for backups.
- Monitor disk health and replace failed disks promptly.
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