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IOPs Miss match

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1 comment

  • Peter Hunter

    There are two factors at play here:

    First, IOPS at the VM layer cannot be directly compared to IOPS at the physical layer.  Although there obviously is a correlation between the virtual and physical layers, there is not a direct one-to-one link.  The IO from the physical layer will be in the VMFS protocol, which significantly alters the IO profile compared to what the virtual layer is contributing.  Other factors, such as caching, etc can play a big role in skewing the differences.

    Secondly, and most importantly, the VM peaks will not necessarily happen at the same points in time, while the physical peak is reported from a single point in time.  The VM peaks will almost certainly be recorded from different points.  So, you can't simply add them up and compare the sum to the physical total, as they would not align.

    I hope this helps answer your question.

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