Citrix VDA memory Cache - Enabled on non PVS or MCS server

Apparently a known issue, for me encountered in 7.12 with no fix as of 7.15

To resolve, either boot into a recovery environment (Or load the filesystem offline to another machine) and load the System registry hive into reg edit.

Make the following changes:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet00x\Services\CtxMcsWbc  startup to 4 (For both 001 and 002)

Additionally (Again in both):

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet00x\Control\Class\{4d36e967-e325-11ce-bfc1-08002be10318} Delete ctxMscWbc from upper filters

Then unload the hive from regedit, and reboot the machine. You should now have a once more persistent filesystem.