Windows Thread, What are the “CacheHitRate” and “CacheHitRate” and “IOPS” Thresholds?? in Technical; ...
3rd October 2013, 01:47 PM #1
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What are the “CacheHitRate” and “CacheHitRate” and “IOPS” Thresholds??
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 (%) |
3rd October 2013, 01:57 PM #2
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?
3rd October 2013, 02:26 PM #3
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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