usage Model
The type of usage of the HPC Cache NFS Target. Possible values are: READ_HEAVY_INFREQ, READ_HEAVY_CHECK_180, READ_ONLY, READ_WRITE, WRITE_WORKLOAD_15, WRITE_AROUND, WRITE_WORKLOAD_CHECK_30, WRITE_WORKLOAD_CHECK_60 and WRITE_WORKLOAD_CLOUDWS.