As Sean said, check your policies, and also make sure FAST is enabled!  And if you are on the later 76 versions of Enginuity, you should have your FRR (relocation rate) set to 7 or higher.  The old default of 5 can be pretty aggressive about moving stuff on the newer releases compared to previous releases.
Hey guys, Trying to explain the behavior I see in a customer Vmax 10k,  I see SATA disk group very busy and FC and EFD not much at all. When I drill down I see the disks busy but when I go one level deeper hypers, there is no host IO all BE stuff,  Does this mean it is the BE director destaging from cache to drives? And how to fix it? So FC and EFD are helping more. Customer said at the first he was binding thin devices to SATA but now knows FC is preferred. Thanks!  [IMAGE][IMAGE][IMAGE]
Vmax performance questions