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Does disk reconstruction lead to performance impact?

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disk-drives
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perf
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Applies to

  • ONTAP 9.x
  • Data ONTAP 8.x
  • Data ONTAP 7-Mode

Answer

  • Data ONTAP completes reconstructs/rebuilds in the least impactful way by design, but still requires some system resources
  • For systems close to a resource bottleneck either at CPU or the disk layer, this can lead to an increase in overall latency 
  • Potential mitigation options:
    • Reduce the overall workload on the node if possible
    • Add disks which will spread workload across more spindles to increase the I/O bandwidth.
    • Move to SSDs which have more I/O bandwidth with decreased I/O latency.

Note: The process of rebuilding the data from parity from a failed drive is more impactful than performing a sick disk copy

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