Enabling cache metrics collection
You need to enable cache metrics collection on both the disk and the virtual machine on which the disk is configured. You can enable collection on as many disks on a virtual machine as you want, but you must enable it on at least one disk for metrics to be collected.
Steps 
1.
From the home page of the FAMC, click the wrench icon for the VM on which you want to enable cache metrics collection and select Cache Metrics > Enable.
From the home page of the FAMC, select each VM on which you want to enable cache metrics collection and click Cache Metrics in the Bulk Actions area of the FAMC. In the cache metrics dialog box, select the Enable button and click Submit.
Note: Select Advanced in the wrench tool menu or Bulk Actions area to enable or disable caching, set the cache mode, and enable or disable cache metrics for VMs or disks in the same step.
2.
Note: You can view the disks for a VM by opening the details page for the VM. FAMC displays a Show Me menu in the left pane. Click VM Disks to navigate to the disks page.
From the disks page of the FAMC, click the wrench icon for the disk on which you want to enable cache metrics collection and select Cache Metrics > Enable.
From the disks page of the FAMC, select each disk on which you want to enable cache metrics collection and click Cache Metrics in the Bulk Actions area of the FAMC. In the cache metrics dialog box, select the Enable button and click Submit.
Result 
The Metrics field for the virtual machines and disks is set to Enabled.
Parent Topic: Specifying cache metrics collection for virtual machines and disks