Deallocating cache space
Occasionally, you may need to deallocate cache space for a virtual machine. You may want to reserve the cache space for another VM or change the cache size on the same VM. You need to disable the VM for caching before you deallocate cache space.
About this task 
Information in the cache is erased for all disks on the virtual machine when you deallocate cache space.
Step 
1.
From the home page of the FAMC, click the wrench icon for the VM for which you want to deallocate cache and select Cache State > Unallocate.
From the home page of the FAMC, select each VM for which you want to deallocate cache and click Unallocate Cache Space in the Bulk Actions area of the FAMC. In the unallocate cache space dialog box, click Unallocate.
Result 
The cache space is deallocated. The entry for the VM is removed from the FAMC home page. You can access the VM on the VM Inventory page of the FAMC.
Parent Topic: Setting the cache size for virtual machines