Enabling caching
You need to enable caching on both the disk and the virtual machine on which the disk is configured. You can enable caching on as many disks on a virtual machine as you want, but you must enable it on at least one disk for caching to be performed.
About this task 
The disks on which you enable caching should be disks that the application accesses locally. You typically should not enable caching on the boot disk or other disks the application does not use.
Steps 
1.
From the home page of the FAMC, click the wrench icon for the VM you want to enable for caching and select Cache State > Enable.
From the home page of the FAMC, select each VM you want to enable for caching and click Cache State in the Bulk Actions area of the FAMC. In the cache state 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 you want to enable for caching and select Cache State > Enable.
From the disks page of the FAMC, select each disk you want to enable for caching and click Cache State in the Bulk Actions area of the FAMC. In the cache state dialog box, select the Enable button and click Submit.
Result 
The Cache State field for the virtual machines and disks is set to Enabled.
Parent Topic: Setting the cache state for virtual machines and disks