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    Question What are the “CacheHitRate” and “CacheHitRate” and “IOPS” Thresholds??

    Hi

    We need to know what are the “CacheHitRate” and “CacheHitRate” and “IOPS” Thresholds?? /recommendation.
    Because we are facing 100% read/write or more utilization in storage.

    Storage: Fujitsu DX80 ISCSI 1Gbps Storage
    Operating System: windows 2008 and windows 2012

    For your reference:
    IOPS Read (IOPS) IOPS Write (IOPS) Data Rate Read (MB/S) Data Rate Write (MB/S) Response Time Read (mS) Response Time Write (mS) CacheHitRate Read (%) CacheHitRate Write (%) CacheHitRate Prefetch (%)

    Regards,
    MDS.

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    Gatt's Avatar
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    High IOPS is bad i believe - that's the number of input/outputs operations per second. (IOPS - Wikipedia, the free encyclopedia)
    The higher that is, the harder your drive is working, meaning it will wear it out quicker, and cause unnessesary read/write delays (slow performance)

    CacheHitRatio will be the amount of data stored in temporary cache, due to the high IOPS - (data waiting to be written to or read from a disk). This can potentially be lost if the system fails.

    Someone correct me if I'm wrong here?

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    IOPs is a performance metric, high isn't bad ... it just means the disks are busy.

    CacheHitRate (our HP SAN doesn't use this term) is probably data served from the cache (avoiding a disk IOP), which is a good thing.

    If you're worried about 'utilization' then your latencies should remain low and not spike around (more IOPS than your disks can handle), not an exact science but i would expect under 20ms unless you have 7200rpm disks (not supposed to be used for high IOPS).

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