https://community.netapp.com/t5/ONTAP-Discussions/Flash-Cache-in-SPM/m-p/130821#M28473 <P>Greetings everyone.</P><P>&nbsp;</P><P>I am not sure if I can ask about SPM here.&nbsp;I ran into a situation that if FlashCache is specified then the throughput prediction goes down.</P><P>&nbsp;</P><P>FAS2650 comes with builtin 1TB FlashCache.&nbsp;My config is one FAS2650 with 2 DS224C fully populated with&nbsp;24 960SSD's, and each FAS2650 controlloer owns one shelf, thus one aggregate, respectively. Then I generate 2 workload profiles of 5TB capacity, 90% random read, 10% random write. The 2 workloads are assigned to 2 aggregates of 2 controllers respectively.</P><P>&nbsp;</P><P>If I chose no FlashCache, the overall throughput is 120K IOPS, and if I chose 512GB FlashCache per controller, it turned out 113K IOPS. Is this reasonable?</P> Wed, 04 Jun 2025 15:07:03 GMT nachin 2025-06-04T15:07:03Z https://community.netapp.com/t5/ONTAP-Discussions/Flash-Cache-in-SPM/m-p/130821#M28473 <P>Greetings everyone.</P><P>&nbsp;</P><P>I am not sure if I can ask about SPM here.&nbsp;I ran into a situation that if FlashCache is specified then the throughput prediction goes down.</P><P>&nbsp;</P><P>FAS2650 comes with builtin 1TB FlashCache.&nbsp;My config is one FAS2650 with 2 DS224C fully populated with&nbsp;24 960SSD's, and each FAS2650 controlloer owns one shelf, thus one aggregate, respectively. Then I generate 2 workload profiles of 5TB capacity, 90% random read, 10% random write. The 2 workloads are assigned to 2 aggregates of 2 controllers respectively.</P><P>&nbsp;</P><P>If I chose no FlashCache, the overall throughput is 120K IOPS, and if I chose 512GB FlashCache per controller, it turned out 113K IOPS. Is this reasonable?</P> Wed, 04 Jun 2025 15:07:03 GMT https://community.netapp.com/t5/ONTAP-Discussions/Flash-Cache-in-SPM/m-p/130821#M28473 nachin 2025-06-04T15:07:03Z