Bug#486549: The single partition present on a CMS minidisk is not supported (s390/s390x only)
This bug applies only to the s390 and s390x architectures.
The single partition implicitly created on a z/VM minidisk by the CMS FORMAT command (and optionally, the CMS RESERVE command) is not recognized by partman. mke2fs, mkswap, etc. recognize such a partition and are able to use it. But partman does not. I don't expect partman to be able to do anything with such a partition (such as create, move, resize, etc.) other than to recognize that it is there, delete it (if requested), optionally format it with mke2fs, mkswap, etc., if needed or requested, and to assign mount points to the partition (technically, to the file system on the partition, whether pre-existing or just created).
Note: partman should warn, if requested to delete such a partition, that if the partition is deleted it cannot be recreated again except by the CMS FORMAT command (and optionally, the CMS RESERVE command).