A computer implemented method, data processing system, and computer usable program code are provided for migrating a persistent cache. A priming request is received at an intermediary to prime the persistent cache of a first partition. Data is moved from a disk to the persistent cache and, responsive to the data being moved to the persistent cache, an unmounting command is issued to unmount a first file system in the first partition from the persistent cache. A mounting command is then issued to mount a second file system in a second partition to the persistent cache, wherein the second partition may now use the data contained in the persistent cache.