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How many IOPs can a FAS or AFF controller handle

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ontap-9
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perf
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Applies to

  • ONTAP 9
  • All FAS and AFF models

Answer

 

Do IOP types matter?
  • Different operations within the same application may require a different IOP limit.
    • It depends on the workload type, as databases will have different i/o requirements than home directories, for example.
  • There is not one answer as IOP types are different based upon read, write, and other.
    • Other IOPs have variable impact depending on type.
    • For example, a directory deletion will take more CPU cycles and disk cycles than an Access operation.
  • Example:
    • Copying large files to ONTAP may be  512kB writes and may only get 10,000 IOPS.
    • Reading lots of small files may be an average of 4 kB read IOPs and can get 70,000 IOPS.
    • That same controller may do 500,000 NFSv3 Access operations.

 

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