topic Cache Hit Rate on volumes with cache disabled in Array Performance and Data Protection https://community.hpe.com/t5/array-performance-and-data/cache-hit-rate-on-volumes-with-cache-disabled/m-p/6983215#M480 <HTML><HEAD></HEAD><BODY><P>I'm wondering why I see data on the cache hit graph for volumes that I have cache disabled on?</P><P></P><P>I also see them in the cache churn graphs in InfoSight.</P><P></P><P>Why is this?</P></BODY></HTML> Thu, 29 Sep 2016 15:47:30 GMT 2016-09-29T15:47:30Z Cache Hit Rate on volumes with cache disabled https://community.hpe.com/t5/array-performance-and-data/cache-hit-rate-on-volumes-with-cache-disabled/m-p/6983215#M480 <HTML><HEAD></HEAD><BODY><P>I'm wondering why I see data on the cache hit graph for volumes that I have cache disabled on?</P><P></P><P>I also see them in the cache churn graphs in InfoSight.</P><P></P><P>Why is this?</P></BODY></HTML> Thu, 29 Sep 2016 15:47:30 GMT https://community.hpe.com/t5/array-performance-and-data/cache-hit-rate-on-volumes-with-cache-disabled/m-p/6983215#M480 2016-09-29T15:47:30Z Re: Cache Hit Rate on volumes with cache disabled https://community.hpe.com/t5/array-performance-and-data/cache-hit-rate-on-volumes-with-cache-disabled/m-p/6983216#M481 <HTML><HEAD></HEAD><BODY><P>Hi Adam,</P><P></P><P>When Caching is selected as 'Disabled' this essentially mandates NimbleOS to bypass SSD cache for any 'cache worthy' reads. However what the file system will still do is read data from NVDIMM or DRAM should the data be residing there as part of the Write IO path. Therefore these cache hits are showing data that may be reading from those two layers of cache <IMG src="https://community.hpe.com/legacyfs/online/emoticons/happy.png" /></P></BODY></HTML> Fri, 30 Sep 2016 12:13:25 GMT https://community.hpe.com/t5/array-performance-and-data/cache-hit-rate-on-volumes-with-cache-disabled/m-p/6983216#M481 Nick_Dyer 2016-09-30T12:13:25Z