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RAID Fault Tolerance:
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RAID (Redundant Array of Independent Disks) fault tolerance refers to the number of disk failures a RAID configuration can withstand without losing data. It is typically equal to the number of parity disks in the array.
The calculator uses the simple formula:
Where:
Explanation: Each parity disk in a RAID array provides tolerance for one disk failure. For example, RAID 5 has 1 parity disk and can tolerate 1 disk failure.
Details: Calculating fault tolerance is crucial for designing reliable storage systems, ensuring data availability, and planning for disaster recovery scenarios.
Tips: Enter the number of parity disks in your RAID configuration. The value must be a non-negative integer.
Q1: What is the difference between RAID levels in terms of fault tolerance?
A: Different RAID levels provide different levels of fault tolerance. RAID 0 has no fault tolerance, RAID 1 can tolerate 1 disk failure, RAID 5 can tolerate 1 disk failure, RAID 6 can tolerate 2 disk failures.
Q2: Can fault tolerance be increased by adding more parity disks?
A: Yes, some RAID implementations allow for additional parity disks to increase fault tolerance beyond standard configurations.
Q3: Does fault tolerance guarantee data recovery?
A: Fault tolerance provides protection against disk failures, but it's not a substitute for regular backups and comprehensive data protection strategies.
Q4: What happens when the number of failed disks exceeds the fault tolerance?
A: If more disks fail than the array's fault tolerance, data loss will occur and the array will need to be rebuilt from backups.
Q5: Are there performance implications to higher fault tolerance?
A: Higher fault tolerance typically requires more parity calculations, which can impact write performance, though read performance may be improved.