Physical data set copy operations require DFSMSdss to obtain the SYSDSN and VSAM enqueues for the source data set. In order to allow this type of serialization the zFS will need to be unmounted from all systems.

Physical data set copy of mounted zFS data sets is not recommended because quiesce is not available during a physical copy. If you specify the TOL(ENQF) keyword during a physical data set copy, the internal control information and data inside the zFS can change during the copy. This can result in a data set copy that is unusable.