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Does disk reconstruction lead to performance impact

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Category:
disk-drives
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perf
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Applies to

  • ONTAP 9.x
  • Data ONTAP 8.x

Answer

Data ONTAP completes reconstructs 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.