آلة حاسبة RAID

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السعة الإجمالية: 2.00 TB

السعة القابلة للاستخدام: 2.00 TB

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RAID Storage Array Documentation

What is RAID?

RAID (Redundant Array of Independent Disks) is a technology that combines multiple hard drives into a single logical storage unit. This technology improves data read/write performance and reliability.

Why Use RAID?

  1. Improved Performance
    • Increases data transfer speeds through parallel disk read/write
    • Reduces I/O bottlenecks
  2. Enhanced Data Reliability
    • Provides fault tolerance through data redundancy
    • Protects data in case of disk failure
  3. Increased Storage Capacity
    • Combines multiple physical disks into larger logical volumes
    • Simplifies storage management

Common RAID Levels and Calculation Formulas

RAID 0 (Striping)

  • Features: Distributes data evenly across all disks
  • Advantages: Maximizes storage space and performance
  • Disadvantages: No redundancy, single disk failure causes total data loss
  • Capacity Formula:
    Total Capacity = Number of Disks × Single Disk Capacity
    

RAID 1 (Mirroring)

  • Features: Data is completely duplicated across two or more disks
  • Advantages: Provides complete data redundancy
  • Disadvantages: Low storage efficiency, only 50%
  • Capacity Formula:
    Total Capacity = Single Disk Capacity
    

RAID 5 (Striping with Parity)

  • Features: Data and parity information distributed across all disks
  • Advantages: Balances performance and redundancy
  • Disadvantages: Lower write performance
  • Minimum Disks: 3
  • Capacity Formula:
    Total Capacity = (Number of Disks - 1) × Single Disk Capacity
    

RAID 6 (Striping with Double Parity)

  • Features: Uses two independent parity blocks
  • Advantages: Can survive two simultaneous disk failures
  • Disadvantages: Lower write performance
  • Minimum Disks: 4
  • Capacity Formula:
    Total Capacity = (Number of Disks - 2) × Single Disk Capacity
    

RAID 10 (RAID 1+0)

  • Features: Combination of RAID 0 and RAID 1
  • Advantages: Combines performance and redundancy benefits
  • Disadvantages: High cost, low storage efficiency
  • Minimum Disks: 4
  • Capacity Formula:
    Total Capacity = (Number of Disks × Single Disk Capacity) ÷ 2
    

RAID Selection Guidelines

  1. Performance Priority: Choose RAID 0
    • Suitable for temporary data or scenarios with other backup solutions
  2. Data Security Priority: Choose RAID 1
    • Suitable for critical small-capacity data storage
  3. Balance of Performance and Security: Choose RAID 5
    • Suitable for most enterprise storage scenarios
  4. High Reliability Requirements: Choose RAID 6
    • Suitable for large capacity storage and long-term archiving
  5. Critical Business Systems: Choose RAID 10
    • Suitable for scenarios requiring both high performance and reliability

Important Notes

  1. RAID is not a substitute for backups
  2. Use identical disk models and capacities when building RAID
  3. Enterprise-grade drives provide better reliability
  4. Regularly check RAID status and disk health
  5. Configure appropriate spare disks for failure recovery

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