Scenario: In a XenDesktop deployment, a Citrix Administrator must install an application that renders locally and creates a large number of temporary files on the local drive of Desktop OS machines…

Cache on server redirects write cache to the Provisioning Server's disk, which has far greater capacity than device RAM and will not exhaust local memory.

Cache in device RAM stores all write cache data entirely in the VM's physical memory with no spillover path. An application that continuously generates large temporary files will progressively fill that fixed-size RAM cache until memory is fully exhausted, causing the kernel to encounter an unrecoverable allocation failure and issue a BSOD.

Cache on server persisted also stores write data on the server and retains it across reboots, providing ample capacity without risk of local memory exhaustion.

Cache in device RAM with overflow on hard disk uses RAM as a fast primary tier but automatically spills excess data to the local hard disk, preventing the memory exhaustion that causes a BSOD.