5+2 is a sizing model for VMware Horizon View Connection Servers, not a deployment model. Always make all your View Connection Servers live. Don’t deploy any as standby servers. That’s more effort for less gain.
For the space reclamation feature to work correctly, ensure that:
VMware Tools provided with vSphere version 5.1 or later are installed on the virtual machine.
The virtual machine is using virtual hardware version 9 or later.
In the View Administrator console, the Reclaim VM disk space option is selected for the vCenter Server. For more information, see Allow vSphere to Reclaim Disk Space in Linked-Clone Virtual Machines in the VMware Horizon View 5.2 Administration Guide.
In the View Administrator console, the Reclaim VM disk space option is selected for the desktop pool. For more information, see Reclaim Disk Space on Linked-Clone Desktops in the VMware Horizon View 5.2 Administration Guide.
The virtual machine is powered on before you initiate the space reclamation operation.
There is space that can be reclaimed. This space exists when data is deleted from the guest OS. Sending files to the Recycle Bin does not delete them.
The virtual machine is using SCSI disks.
Change Block Tracking (CBT) is disabled on the parent virtual machine.